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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: WELLS FARGO ASSET SECURITIES CORP MORTGAGE PASS-THROUGH CERT |  WACHOVIA BANK, NATIONAL ASSOCIATION | WELLS FARGO ASSET SECURITIES CORPORATION You are currently viewing:
This Pooling and Servicing Agreement involves

WELLS FARGO ASSET SECURITIES CORP MORTGAGE PASS-THROUGH CERT | WACHOVIA BANK, NATIONAL ASSOCIATION | WELLS FARGO ASSET SECURITIES CORPORATION

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: New York     Date: 1/5/2006

POOLING AND SERVICING AGREEMENT, Parties: wells fargo asset securities corp mortgage pass-through cert ,  wachovia bank  national association , wells fargo asset securities corporation
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                                                                       EXHIBIT 4

       -------------------------------------------------------------------


                    WELLS FARGO ASSET SECURITIES CORPORATION

                                     (Seller)

                                       and

                             WELLS FARGO BANK, N.A.

                                (Master Servicer)

                                       and

                       WACHOVIA BANK, NATIONAL ASSOCIATION

                                    (Trustee)

                         POOLING AND SERVICING AGREEMENT

                          Dated as of December 22, 2005

                                 $785,386,781.97

                       Mortgage Pass-Through Certificates
                                 Series 2005-16


        -----------------------------------------------------------------

<PAGE>

                                TABLE OF CONTENTS

                                    ARTICLE I

                                    DEFINITIONS

Section 1.01      Definitions..................................................
Section 1.02      Acts of Holders..............................................
Section 1.03      Effect of Headings and Table of Contents.....................
Section 1.04      Benefits of Agreement........................................

                                   ARTICLE II

                          CONVEYANCE OF MORTGAGE LOANS;
                      ORIGINAL ISSUANCE OF THE CERTIFICATES

Section 2.01      Conveyance of Mortgage Loans.................................
Section 2.02      Acceptance by Custodian......................................
Section 2.03      Representations and Warranties of the Master Servicer and
                   the Seller..................................................
Section 2.04      Execution and Delivery of Certificates.......................
Section 2.05      Designation of Certificates; Designation of Startup Day
                  and Latest Possible Maturity Date...........................
Section 2.06      Optional Substitution of Mortgage Loans......................

                                   ARTICLE III

                ADMINISTRATION OF THE TRUST ESTATE; SERVICING
                               OF THE MORTGAGE LOANS

Section 3.01      Certificate Account..........................................
Section 3.02      Permitted Withdrawals from the Certificate Account...........
Section 3.03      Advances by Master Servicer and Trustee......................
Section 3.04      Custodian to Cooperate; Release of Owner Mortgage Loan
                  Files and Retained Mortgage Loan Files......................
Section 3.05      Reports to the Trustee; Annual Compliance Statements.........
Section 3.06       Title, Management and Disposition of Any REO Mortgage
                  Loan........................................................
Section 3.07      Amendments to Servicing Agreements, Modification of
                  Standard Provisions.........................................
Section 3.08      Oversight of Servicing.......................................
Section 3.09      Termination and Substitution of Servicing Agreements.........
Section 3.10      Application of Net Liquidation Proceeds......................
Section 3.11      Exchange Act Reports.........................................

                                   ARTICLE IV

                    DISTRIBUTIONS IN RESPECT OF CERTIFICATES;
                         PAYMENTS TO CERTIFICATEHOLDERS;
                              STATEMENTS AND REPORTS

Section 4.01      Distributions................................................
Section 4.02      Allocation of Realized Losses................................
Section 4.03      Paying Agent.................................................
Section 4.04      Statements to Certificateholders; Reports to the Trustee,
                  MBIA and the Seller.........................................
Section 4.05      Reports to Mortgagors and the Internal Revenue Service.......
Section 4.06      Reserve Fund.................................................
Section 4.07      Distributions in Reduction of the Class A-1 Certificates.....
Section 4.08      Policy Matters...............................................
Section 4.09      Calculation of Amounts; Binding Effect of Interpretations
                  and Actions of Master Servicer..............................
Section 4.10      Determination of LIBOR.......................................

                                     ARTICLE V

                                THE CERTIFICATES

Section 5.01      The Certificates.............................................
Section 5.02      Registration of Certificates.................................
Section 5.03      Mutilated, Destroyed, Lost or Stolen Certificates............
Section 5.04      Persons Deemed Owners........................................
Section 5.05      Access to List of Certificateholders' Names and Addresses....
Section 5.06      Maintenance of Office or Agency..............................
Section 5.07      Definitive Certificates......................................
Section 5.08      Notices to Clearing Agency...................................

                                   ARTICLE VI

                        THE SELLER AND THE MASTER SERVICER

Section 6.01      Liability of the Seller and the Master Servicer..............
Section 6.02      Merger or Consolidation of the Seller or the Master
                  Servicer....................................................
Section 6.03      Limitation on Liability of the Seller, the Master
                  Servicer and Others.........................................
Section 6.04      Resignation of the Master Servicer...........................
Section 6.05      Compensation to the Master Servicer..........................
Section 6.06      Assignment or Delegation of Duties by Master Servicer........
Section 6.07      Indemnification of Trustee and Seller by Master Servicer.....

                                   ARTICLE VII

                                     DEFAULT

Section 7.01      Events of Default............................................
Section 7.02      Other Remedies of Trustee....................................
Section 7.03      Directions by Certificateholders and
                  Duties of Trustee During Event of Default...................
Section 7.04      Action upon Certain Failures of the Master Servicer and
                  upon Event of Default.......................................
Section 7.05       Trustee to Act; Appointment of Successor.....................
Section 7.06      Notification to Certificateholders...........................

                                  ARTICLE VIII

                             CONCERNING THE TRUSTEE

Section 8.01      Duties of Trustee............................................
Section 8.02      Certain Matters Affecting the Trustee........................
Section 8.03      Trustee Not Required to Make Investigation...................
Section 8.04      Trustee Not Liable for Certificates or Mortgage Loans........
Section 8.05      Trustee May Own Certificates.................................
Section 8.06      The Master Servicer to Pay Fees and Expenses.................
Section 8.07      Eligibility Requirements.....................................
Section 8.08      Resignation and Removal......................................
Section 8.09      Successor....................................................
Section 8.10      Merger or Consolidation......................................
Section 8.11      Authenticating Agent.........................................
Section 8.12      Separate Trustees and Co-Trustees............................
Section 8.13      Tax Matters; Compliance with REMIC Provisions................
Section 8.14      Monthly Advances.............................................

                                   ARTICLE IX

                                   TERMINATION

Section 9.01      Termination upon Purchase by the Seller or Liquidation of
                   All Mortgage Loans..........................................
Section 9.02      Additional Termination Requirements..........................

                                    ARTICLE X

                            MISCELLANEOUS PROVISIONS

Section 10.01     Amendment....................................................
Section 10.02     Recordation of Agreement.....................................
Section 10.03     Limitation on Rights of Certificateholders...................
Section 10.04     Governing Law; Jurisdiction..................................
Section 10.05     Notices......................................................
Section 10.06     Severability of Provisions...................................
Section 10.07     Special Notices to Rating Agencies and MBIA..................
Section 10.08     Covenant of Seller...........................................
Section 10.09     Recharacterization...........................................

                                   ARTICLE XI

                              TERMS FOR CERTIFICATES

Section 11.01     Cut-Off Date.................................................
Section 11.02     Cut-Off Date Aggregate Principal Balance.....................
Section 11.03     Original Class A Percentage..................................
Section 11.04     Original Principal Balances of the Classes of Class A
                  Certificates................................................
Section 11.04(a) Original Notional Amount.....................................

Section 11.05     Original Aggregate Non-PO Principal Balance..................
Section 11.06     Original Class B Principal Balance...........................
Section 11.07     Original Principal Balances of the Classes of Class B
                  Certificates................................................
Section 11.08     Original Class B-1 Fractional Interest.......................
Section 11.09     Original Class B-2 Fractional Interest.......................
Section 11.10     Original Class B-3 Fractional Interest.......................
Section 11.11     Original Class B-4 Fractional Interest.......................
Section 11.12     Original Class B-5 Fractional Interest.......................
Section 11.13     Original Class B-1 Percentage................................
Section 11.14     Original Class B-2 Percentage................................
Section 11.15     Original Class B-3 Percentage................................
Section 11.16     Original Class B-4 Percentage................................
Section 11.17     Original Class B-5 Percentage................................
Section 11.18     Original Class B-6 Percentage................................
Section 11.19     Closing Date.................................................
Section 11.20     Right to Purchase............................................
Section 11.21     Wire Transfer Eligibility....................................
Section 11.22     Single Certificate...........................................
Section 11.23     Servicing Fee Rate...........................................
Section 11.24     Master Servicing Fee Rate....................................
Section 11.25     MBIA Contact Person..........................................

SCHEDULE I        Applicable Unscheduled Principal Receipt Period

<PAGE>

                                    EXHIBITS
                                    --------

EXHIBIT A-1              -      Form of Face of Class A-1 Certificate
EXHIBIT A-2              -      Form of Face of Class A-2 Certificate
EXHIBIT A-3              -       Form of Face of Class A-3 Certificate
EXHIBIT A-4              -      Form of Face of Class A-4 Certificate
EXHIBIT A-5              -      Form of Face of Class A-5 Certificate
EXHIBIT A-6              -      Form of Face of Class A-6 Certificate
EXHIBIT A-7              -      Form of Face of Class A-7 Certificate
EXHIBIT A-8              -      Form of Face of Class A-8 Certificate
EXHIBIT A-9              -      Form of Face of Class A-9 Certificate
EXHIBIT A-10             -      Form of Face of Class A-10 Certificate
EXHIBIT A-11             -      Form of Face of Class A-11 Certificate
EXHIBIT A-12             -      Form of Face of Class A-12 Certificate
EXHIBIT A-13             -      Form of Face of Class A-13 Certificate
EXHIBIT A-14             -      Form of Face of Class A-14 Certificate
EXHIBIT A-15             -      Form of Face of Class A-15 Certificate
EXHIBIT A-16             -      Form of Face of Class A-16 Certificate
EXHIBIT A-17             -      Form of Face of Class A-17 Certificate
EXHIBIT A-18             -      Form of Face of Class A-18 Certificate
EXHIBIT A-19             -      Form of Face of Class A-19 Certificate
EXHIBIT A-R              -      Form of Face of Class A-R Certificate
EXHIBIT A-PO             -      Form of Face of Class A-PO Certificate
EXHIBIT B-1              -      Form of Face of Class B-1 Certificate
EXHIBIT B-2              -      Form of Face of Class B-2 Certificate
EXHIBIT B-3              -      Form of Face of Class B-3 Certificate
EXHIBIT B-4              -      Form of Face of Class B-4 Certificate
EXHIBIT B-5              -      Form of Face of Class B-5 Certificate
EXHIBIT B-6              -      Form of Face of Class B-6 Certificate
EXHIBIT C                -      Form of Reverse of Series 2005-16 Certificates
EXHIBIT D                -      Reserved
EXHIBIT E                -      Custodial Agreement
EXHIBIT F-1              -      Schedule of Type 1 Mortgage Loans
EXHIBIT F-2              -      Schedule of Other Servicer Mortgage Loans
EXHIBIT G                -      Request for Release
EXHIBIT H                 -      Affidavit Pursuant to Section 860E(e)(4) of the
                              Internal Revenue Code of 1986, as amended, and
                              for Non-ERISA Investors
EXHIBIT I                -      Letter from Transferor of Class A-R Certificate
EXHIBIT J                -      Transferee's Letter (Class [B-4] [B-5] [B-6]
                              Certificates)
EXHIBIT K                -      List of Recordation States
EXHIBIT L                -      Servicing Agreements
EXHIBIT M                 -      Form of Special Servicing Agreement
EXHIBIT N                -      Form of Initial Certification of the Custodian
EXHIBIT O                -      Form of Final Certification of the Custodian
EXHIBIT P                -      Form of Sarbanes Oxley Certification
EXHIBIT Q                -      Form of Policy

<PAGE>

            This Pooling and Servicing Agreement, dated as of December 22, 2005
executed by WELLS FARGO ASSET SECURITIES CORPORATION, as Seller, WELLS FARGO
BANK, N.A., as Master Servicer and WACHOVIA BANK, NATIONAL ASSOCIATION, as
Trustee.

                          W I T N E S S E T H   T H A T:

            In consideration of the mutual agreements herein contained, the
Seller, the Master Servicer and the Trustee agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

            Section 1.01 Definitions.

            Whenever used herein, the following words and phrases, unless the
context otherwise requires, shall have the meanings specified in this Article.

            Accepted Master Servicing Practices: Accepted Master Servicing
Practices shall consist of the customary and usual master servicing practices of
prudent master servicing institutions which service mortgage loans of the same
type as the Mortgage Loans in the jurisdictions in which the related Mortgaged
Properties are located, regardless of the date upon which the related Mortgage
Loans were originated.

            Accretion Termination Date: The earlier to occur of (i) the
Distribution Date following the Distribution Date on which the Principal
Balances of the Class A-3, Class A-5 and Class A-11 Certificates have been
reduced to zero or (ii) the Subordination Depletion Date.

            Accrual Certificates: The Class A-6 Certificates.

            Accrual Distribution Amount: As to any Distribution Date prior to
the Accretion Termination Date and the Accrual Certificates, an amount equal to
the sum of (i) the Class A Interest Percentage of the Accrual Certificates of
the Current Class A Interest Distribution Amount and (ii) the Class A Interest
Shortfall Percentage of the Accrual Certificates of the amount distributed in
respect of the Classes of Class A Certificates pursuant to Paragraph second of
Section 4.01(a) on such Distribution Date. As to any Distribution Date and the
Accrual Certificates on or after the Accretion Termination Date, zero.

            Adjusted Pool Amount: With respect to any Distribution Date, the
Cut-Off Date Aggregate Principal Balance of the Mortgage Loans minus the sum of
(i) all amounts in respect of principal received in respect of the Mortgage
Loans (including, without limitation, amounts received as Monthly Payments,
Periodic Advances, Unscheduled Principal Receipts and Substitution Principal
Amounts) and distributed to Holders of the Certificates on such Distribution
Date and all prior Distribution Dates, (ii) the principal portion of all
Liquidated Loan Losses incurred on such Mortgage Loans for which the Liquidation
Proceeds were received from the Cut-Off Date through the end of the Applicable
Unscheduled Principal Receipt Period with respect to Full Unscheduled Principal
Receipts for such Distribution Date and (iii) the principal portion of all
Bankruptcy Losses (other than Debt Service Reductions) incurred on the Mortgage
Loans from the Cut-Off Date through the end of the period corresponding to the
Applicable Unscheduled Principal Receipt Period with respect to Full Unscheduled
Principal Receipts for such Distribution Date.

             Adjusted Pool Amount (Non-PO Portion): With respect to any
Distribution Date, the difference between the Adjusted Pool Amount and the
Adjusted Pool Amount (PO Portion).

            Adjusted Pool Amount (PO Portion): With respect to any Distribution
Date, the sum of the amounts, calculated as follows, with respect to all
Outstanding Mortgage Loans: the product of (i) the PO Fraction for each such
Mortgage Loan and (ii) the remainder of (A) the Cut-Off Date Principal Balance
of such Mortgage Loan minus (B) the sum of (x) all amounts in respect of
principal received in respect of such Mortgage Loan (including, without
limitation, amounts received as Monthly Payments, Periodic Advances, Unscheduled
Principal Receipts and Substitution Principal Amounts) and distributed to
Holders of the Certificates on such Distribution Date and all prior Distribution
Dates, (y) the principal portion of any Liquidated Loan Losses incurred on such
Mortgage Loans for which Liquidation Proceeds were received from the Cut-Off
Date through the end of the Applicable Unscheduled Principal Receipt Period with
respect to Full Unscheduled Principal Receipts for such Distribution Date and
(z) the principal portion of all Bankruptcy Losses (other than Debt Service
Reductions) incurred on the Mortgage Loans from the Cut-Off Date through the end
of the period corresponding to the Applicable Unscheduled Principal Receipt
Period with respect to Full Unscheduled Principal Receipts for such Distribution
Date.

            Adjusted Principal Balance: As to any Distribution Date and any
Class of Class B Certificates, the greater of (A) zero and (B) (i) the Principal
Balance of such Class with respect to such Distribution Date minus (ii) the
Adjustment Amount for such Distribution Date less the Principal Balances for any
Classes of Class B Certificates with higher numerical designations.

            Adjustment Amount: For any Distribution Date, the difference between
(A) the sum of the Class A Non-PO Principal Balance and the Class B Principal
Balance as of the related Determination Date and (B) the sum of (i) the sum of
the Class A Non-PO Principal Balance and the Class B Principal Balance as of the
Determination Date succeeding such Distribution Date and (ii) the aggregate
amount that would have been distributed to all Classes (other than the Class
A-PO Certificates) as principal in accordance with Section 4.01(a) for such
Distribution Date without regard to the provisos in the definitions of Class B-1
Optimal Principal Amount, Class B-2 Optimal Principal Amount, Class B-3 Optimal
Principal Amount, Class B-4 Optimal Principal Amount, Class B-5 Optimal
Principal Amount and Class B-6 Optimal Principal Amount.

            Aggregate Class A Unpaid Interest Shortfall: As to any Distribution
Date, an amount equal to the sum of the Class A Unpaid Interest Shortfalls for
all the Classes of Class A Certificates.

            Aggregate Non-PO Principal Balance: As of any Determination Date,
the sum of the Class A Non-PO Principal Balance and the Class B Principal
Balance as of such date.

            Agreement: This Pooling and Servicing Agreement and all amendments
and supplements hereto.

            Applicable Unscheduled Principal Receipt Period: With respect to the
Mortgage Loans serviced by each Servicer and each of the Full Unscheduled
Principal Receipts and Partial Unscheduled Principal Receipts, the Unscheduled
Principal Receipt Period specified on Schedule I hereto.

            Authenticating Agent: Any authenticating agent appointed by the
Trustee pursuant to Section 8.11. There shall initially be no Authenticating
Agent for the Certificates.

            Available Master Servicer Compensation: With respect to any
Distribution Date, the sum of (a) the Master Servicing Fee for such Distribution
Date, (b) interest earned through the business day preceding the applicable
Distribution Date on any Prepayments in Full remitted to the Master Servicer and
(c) the aggregate amount of Month End Interest remitted by the Servicers to the
Master Servicer pursuant to the related Servicing Agreements.

            Bankruptcy Code: The Bankruptcy Code of 1978, as amended.

            Bankruptcy Loss: With respect to any Mortgage Loan, a Deficient
Valuation or Debt Service Reduction; provided, however, that a Bankruptcy Loss
shall not be deemed a Bankruptcy Loss hereunder so long as the applicable
Servicer has notified the Master Servicer and the Trustee in writing that such
Servicer is diligently pursuing any remedies that may exist in connection with
the representations and warranties made regarding the related Mortgage Loan and
either (A) the related Mortgage Loan is not in default with regard to payments
due thereunder or (B) delinquent payments of principal and interest under the
related Mortgage Loan and any premiums on any applicable primary hazard
insurance policy and any related escrow payments in respect of such Mortgage
Loan are being advanced on a current basis by such Servicer without giving
effect to any Debt Service Reduction.

            Beneficial Owner: With respect to a Book-Entry Certificate, the
Person who is the beneficial owner of such Book-Entry Certificate, as reflected
on the books of the Clearing Agency, or on the books of a Person maintaining an
account with such Clearing Agency (directly or as an indirect participant, in
accordance with the rules of such Clearing Agency), as the case may be.

            Book-Entry Certificate: Any one of the Class A-1 Certificates, Class
A-2 Certificates, Class A-3 Certificates, Class A-4 Certificates, Class A-5
Certificates, Class A-6 Certificates, Class A-7 Certificates, Class A-8
Certificates, Class A-9 Certificates, Class A-10 Certificates, Class A-11
Certificates, Class A-12 Certificates, Class A-13 Certificates, Class A-14
Certificates, Class A-15 Certificates, Class A-16 Certificates, Class A-17
Certificates, Class A-18 Certificates, Class A-19 Certificates, Class A-PO
Certificates, Class B-1 Certificates, Class B-2 Certificates and Class B-3
Certificates, beneficial ownership and transfers of which shall be evidenced by,
and made through, book entries by the Clearing Agency as described in Section
5.01(b).

            Business Day: Any day other than (i) a Saturday or a Sunday, or (ii)
a legal holiday in the City of New York, State of Iowa, State of Maryland, State
of Minnesota or State of North Carolina or (iii) a day on which banking
institutions in the City of New York, or the State of Iowa, State of Maryland,
State of Minnesota or State of North Carolina are authorized or obligated by law
or executive order to be closed.

            Certificate: Any one of the Class A Certificates or Class B
Certificates.

            Certificate Account: The separate trust account established and
maintained by the Master Servicer in the name of the Master Servicer on behalf
of the Trustee pursuant to Section 3.01. The Certificate Account shall be an
Eligible Account.

            Certificate Custodian: Initially, Wachovia Bank, National
Association; thereafter any other Certificate Custodian acceptable to The
Depository Trust Company and selected by the Trustee.

            Certificate Register and Certificate Registrar: Respectively, the
register maintained pursuant to and the registrar provided for in Section 5.02.
The initial Certificate Registrar is the Trustee.

            Certificateholder or Holder: The Person in whose name a Certificate
is registered in the Certificate Register, except that, solely for the purposes
of the taking of any action under Articles VII or VIII, any Certificate
registered in the name of the Master Servicer, a Servicer or any affiliate
thereof shall be deemed not to be outstanding and the Voting Interest evidenced
thereby shall not be taken into account in determining whether the requisite
percentage of Certificates necessary to effect any such action has been
obtained.

            Class: All certificates whose form is identical except for
variations in the Percentage Interest evidenced thereby.

            Class A Certificate: Any of the Class A-1 Certificates, Class A-2
Certificates, Class A-3 Certificates, Class A-4 Certificates, Class A-5
Certificates, Class A-6 Certificates, Class A-7 Certificates, Class A-8
Certificates, Class A-9 Certificates, Class A-10 Certificates, Class A-11
Certificates, Class A-12 Certificates, Class A-13 Certificates, Class A-14
Certificates, Class A-15 Certificates, Class A-16 Certificates, Class A-17
Certificates, Class A-18 Certificates, Class A-19 Certificates, Class A-R
Certificate and Class A-PO Certificates.

            Class A Certificateholder: The registered holder of a Class A
Certificate.

            Class A Distribution Amount: As to any Distribution Date and any
Class of Class A Certificates (other than the Accrual Certificates, Interest
Only Certificates, Class A-14 Certificates and Class A-PO Certificates), the
amount distributable to such Class of Class A Certificates pursuant to
Paragraphs first, second and third clause (1) of Section 4.01(a). As to the
Accrual Certificates, (a) as to any Distribution Date prior to the Accretion
Termination Date, the amount distributable to such Accrual Certificates pursuant
to the provisos in Paragraphs first and second of Section 4.01(a) and Paragraph
third clause (1) of Section 4.01(a) and (b) as to any Distribution Date on or
after the Accretion Termination Date, the amount distributable to such Accrual
Certificates pursuant to Paragraphs first, second and third of Section 4.01(a).
As to the Interest Only Certificates and any Distribution Date, the amount
distributable to such Class pursuant to Paragraphs first and second of Section
4.01(a). As to any Distribution Date and the Class A-14 Certificates, the amount
distributable to the Class A-14 Certificates pursuant to Paragraph third clause
(1) of Section 4.01(a) on such Distribution Date. As to any Distribution Date
and the Class A-PO Certificates, the amount distributable to the Class A-PO
Certificates pursuant to Paragraphs third clause (2) and fourth of Section
4.01(a) on such Distribution Date.

            Class A Interest Accrual Amount: As to any Distribution Date, the
sum of the Interest Accrual Amounts for the Class A Certificates with respect to
such Distribution Date.

            Class A Interest Percentage: As to any Distribution Date and any
Class of Class A Certificates, the percentage calculated by dividing the
Interest Accrual Amount of such Class (determined without regard to clause (ii)
of the definition thereof) by the Class A Interest Accrual Amount (determined
without regard to clause (ii) of the definition of each Interest Accrual
Amount).

            Class A Interest Shortfall Amount: As to any Distribution Date and
any Class of Class A Certificates, any amount by which the Interest Accrual
Amount of such Class with respect to such Distribution Date exceeds the amount
distributed in respect of such Class on such Distribution Date pursuant to
Paragraph first of Section 4.01(a), including, in the case of the Accrual
Certificates prior to the Accretion Termination Date, the amount included in the
Accrual Distribution Amount pursuant to clause (i) of the definition thereof.

            Class A Interest Shortfall Percentage: As to any Distribution Date
and any Class of Class A Certificates, the percentage calculated by dividing the
Class A Unpaid Interest Shortfall for such Class by the Aggregate Class A Unpaid
Interest Shortfall, in each case determined as of the day preceding the
applicable Distribution Date.

            Class A Loss Denominator: As to any Determination Date, an amount
equal to the sum of (i) the Class A Non-PO Principal Balance (less the Principal
Balance of the Accrual Certificates) and (ii) with respect to the Accrual
Certificates, the lesser of the Principal Balance of the Accrual Certificates
and the Original Principal Balance of the Accrual Certificates.

             Class A Loss Percentage: As to any Determination Date and any Class
of Class A Certificates (other than the Class A-PO Certificates), the percentage
calculated by dividing the Principal Balance of such Class (or, in the case of
the Accrual Certificates, the Original Principal Balance of such Accrual
Certificates, if lower) by the Class A Loss Denominator (determined without
regard to any such Principal Balance of any Class of Class A Certificates not
then outstanding), in each case determined as of the preceding Determination
Date.

            Class A Non-PO Optimal Amount: As to any Distribution Date, the sum
for such Distribution Date of (i) the Class A Interest Accrual Amount, (ii) the
Aggregate Class A Unpaid Interest Shortfall, (iii) the Premium Payment, (iv) the
Premium Unpaid Shortfall and (v) the Class A Non-PO Optimal Principal Amount.

            Class A Non-PO Optimal Principal Amount: As to any Distribution
Date, an amount equal to the sum of (I) the sum, as to each Mortgage Loan that
is an Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with
respect to such Mortgage Loan, and (y) the sum of:

            (i) the Class A Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

            (ii) the Class A Prepayment Percentage of all Unscheduled Principal
      Receipts (other than Recoveries) that were received by a Servicer with
      respect to such Mortgage Loan during the Applicable Unscheduled Principal
      Receipt Period relating to such Distribution Date for each applicable type
      of Unscheduled Principal Receipt;

            (iii) the Class A Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class A Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class A Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date.

            Class A Non-PO Principal Balance: As of any date, an amount equal to
the Class A Principal Balance less the Principal Balance of the Class A-PO
Certificates.

            Class A Non-PO Principal Distribution Amount: As to any Distribution
Date, the aggregate amount distributed in respect of the Classes of A
Certificates pursuant to Paragraph third clause (1) of Section 4.01(a).

            Class A Pass-Through Rate: As to the Class A-2 and Class A-7
Certificates, 5.000% per annum. As to the Class A-R Certificates, 5.500% per
annum. As to the Class A-4, Class A-6, Class A-8, Class A-9, Class A-10, Class
A-13, Class A-15, Class A-16, Class A-17 and Class A-19 Certificates, 5.750% per
annum. As to the Class A-1 and Class A-18 Certificates, 6.000% per annum. As to
the Class A-3, Class A-5, Class A-11 and Class A-12 Certificates, the Class A-3
Pass-Through Rate, Class A-5 Pass-Through Rate, Class A-11 Pass-Through Rate and
Class A-12 Pass-Through Rate, respectively. The Class A-14 and Class A-PO
Certificates are not entitled to interest and have no Class A Pass-Through Rate.

             Class A Percentage: As to any Distribution Date occurring on or
prior to the Subordination Depletion Date, the lesser of (i) 100% and (ii) the
percentage obtained by dividing the Class A Non-PO Principal Balance (determined
as of the Determination Date preceding such Distribution Date) by the Pool
Balance (Non-PO Portion). As to any Distribution Date occurring subsequent to
the Subordination Depletion Date, 100% or such lesser percentage which will
cause the Class A Non-PO Principal Balance to decline to zero following the
distribution made on such Distribution Date.

            Class A Prepayment Percentage: As to any Distribution Date to and
including the Distribution Date in December 2010, 100%. As to any Distribution
Date subsequent to December 2010 to and including the Distribution Date in
December 2011, the Class A Percentage as of such Distribution Date plus 70% of
the Subordinated Percentage as of such Distribution Date. As to any Distribution
Date subsequent to December 2011 to and including the Distribution Date in
December 2012, the Class A Percentage as of such Distribution Date plus 60% of
the Subordinated Percentage as of such Distribution Date. As to any Distribution
Date subsequent to December 2012 to and including the Distribution Date in
December 2013, the Class A Percentage as of such Distribution Date plus 40% of
the Subordinated Percentage as of such Distribution Date. As to any Distribution
Date subsequent to December 2013 to and including the Distribution Date in
December 2014, the Class A Percentage as of such Distribution Date plus 20% of
the Subordinated Percentage as of such Distribution Date. As to any Distribution
Date subsequent to December 2014, the Class A Percentage as of such Distribution
Date. The foregoing is subject to the following: (i) if the aggregate
distribution to Holders of Class A Certificates on any Distribution Date of the
Class A Prepayment Percentage provided above of Unscheduled Principal Receipts
distributable on such Distribution Date would reduce the Class A Non-PO
Principal Balance below zero, the Class A Prepayment Percentage for such
Distribution Date shall be the percentage necessary to bring the Class A Non-PO
Principal Balance to zero and thereafter the Class A Prepayment Percentage shall
be zero and (ii) if the Class A Percentage as of any Distribution Date is
greater than the Original Class A Percentage, the Class A Prepayment Percentage
for such Distribution Date shall be 100%. Notwithstanding the foregoing, with
respect to any Distribution Date on which the following criteria are not met,
the reduction of the Class A Prepayment Percentage described in the second
through sixth sentences of this definition of Class A Prepayment Percentage
shall not be applicable with respect to such Distribution Date. In such event,
the Class A Prepayment Percentage for such Distribution Date will be determined
in accordance with the applicable provision, as set forth in the first through
fifth sentences above, which was actually used to determine the Class A
Prepayment Percentage for the Distribution Date occurring in the December
preceding such Distribution Date (it being understood that for the purposes of
the determination of the Class A Prepayment Percentage for the current
Distribution Date, the current Class A Percentage and Subordinated Percentage
shall be utilized).

            No reduction in the Class A Prepayment Percentage referred to in the
second through sixth sentences hereof shall be applicable, with respect to any
Distribution Date if (a) the average outstanding principal balance on such
Distribution Date and for the preceding five Distribution Dates on the Mortgage
Loans that were delinquent 60 days or more (including for this purpose any
payments due with respect to Mortgage Loans in foreclosure and REO Mortgage
Loans) were greater than or equal to 50% of the Class B Principal Balance or (b)
cumulative Realized Losses on the Mortgage Loans exceed (1) 30% of the Original
Class B Principal Balance if such Distribution Date occurs between and including
January 2011 and December 2011, (2) 35% of the Original Class B Principal
Balance if such Distribution Date occurs between and including January 2012 and
December 2012, (3) 40% of the Original Class B Principal Balance if such
Distribution Date occurs between and including January 2013 and December 2013,
(4) 45% of the Original Class B Principal Balance if such Distribution Date
occurs between and including January 2014 and December 2014, and (5) 50% of the
Original Class B Principal Balance if such Distribution Date occurs during or
after January 2015. With respect to any Distribution Date on which the Class A
Prepayment Percentage is reduced below the Class A Prepayment Percentage for the
prior Distribution Date, the Master Servicer shall certify to the Trustee, based
upon information provided by each Servicer as to the Mortgage Loans serviced by
it that the criteria set forth in the preceding sentence are met.

            Class A Principal Balance: As of any date, an amount equal to the
sum of the Principal Balances for the Class A-1 Certificates, Class A-2
Certificates, Class A-3 Certificates, Class A-4 Certificates, Class A-5
Certificates, Class A-6 Certificates, Class A-7 Certificates, Class A-8
Certificates, Class A-9 Certificates, Class A-10 Certificates, Class A-11
Certificates, Class A-13 Certificates, Class A-14 Certificates, Class A-15
Certificates, Class A-16 Certificates, Class A-17 Certificates, Class A-18
Certificates, Class A-19 Certificates, Class A-PO Certificates and Class A-R
Certificate.

            Class A Unpaid Interest Shortfall: As to any Distribution Date and
any Class of Class A Certificates, the amount, if any, by which the aggregate of
the Class A Interest Shortfall Amounts for such Class (or in the case of the
Accrual Certificates prior to the Accretion Termination Date, the amount
included in the Accrual Distribution Amount pursuant to clause (ii) of the
definition thereof) for prior Distribution Dates is in excess of the amounts
distributed in respect of such Class on prior Distribution Dates pursuant to
Paragraph second of Section 4.01(a).

            Class A-1 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-1 and Exhibit C hereto.

            Class A-1 Certificateholder: The registered holder of a Class A-1
Certificate.

            Class A-1 Interest Loss Amount: As to any Distribution Date, the
excess, if any, of (i) the Interest Accrual Amount for the Class A-1
Certificates (determined without regard to clause (ii) of the definition
thereof), net of any Non-Supported Interest Shortfalls allocated to the Class
A-1 Certificates and net of any Relief Act Shortfalls allocated to the Class A-1
Certificates over (ii) the amount of the Pool Distribution Amount available to
be distributed in respect of the Class A-1 Certificates on such Distribution
Date pursuant to Paragraph first of Section 4.01(a).

            Class A-1 Principal Adjustment: As to any Distribution Date will
equal any amount allocated to the Class A-1 Certificates on the following
Determination Date which reduces the Principal Balance of such Certificates
pursuant to the third sentence of the definition of Principal Balance.

            Class A-1 Principal Loss Amount: With respect to any Distribution
Date, without duplication, the Class A-1 Principal Adjustment, if any, with
respect to such Distribution Date after taking into account all distributions to
be made on such Distribution Date.

            Class A-2 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-2 and Exhibit C hereto.

            Class A-2 Certificateholder: The registered holder of a Class A-2
Certificate.

            Class A-2 Loss Amount: With respect to any Determination Date after
the Subordination Depletion Date, the amount, if any, by which the Principal
Balance of the Class A-2 Certificates would be reduced as a result of the
application of the third sentence of the definition of Principal Balance.

            Class A-3 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-3 and Exhibit C hereto.

            Class A-3 Certificateholder: The registered holder of a Class A-3
Certificate.

            Class A-3 Pass-Through Rate: With respect to the Distribution Date
occurring in January 2006, 5.190% per annum. With respect to each succeeding
Distribution Date, a per annum rate, determined by the Trustee on the applicable
Rate Determination Date, equal to LIBOR plus 0.900%, subject to a minimum rate
of 0.900% and a maximum rate of 6.750%.

            Class A-4 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-4 and Exhibit C hereto.

            Class A-4 Certificateholder: The registered holder of a Class A-4
Certificate.

            Class A-4 Loss Amount: With respect to any Determination Date after
the Subordination Depletion Date, the amount, if any, by which the Principal
Balance of the Class A-4 Certificates would be reduced as a result of the
application of the third sentence of the definition of Principal Balance.

            Class A-5 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-5 and Exhibit C hereto.

            Class A-5 Certificateholder: The registered holder of a Class A-5
Certificate.

            Class A-5 Pass-Through Rate: With respect to the Distribution Date
occurring in January 2006, 8.395% per annum. With respect to each succeeding
Distribution Date, a per annum rate, determined by the Trustee on the applicable
Rate Determination Date, equal to 33.0625% minus the product of 5.750 times
LIBOR, subject to a minimum rate of 0.000% and a maximum rate of 33.0625%.

            Class A-6 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-6 and Exhibit C hereto.

            Class A-6 Certificateholder: The registered holder of a Class A-6
Certificate.

            Class A-7 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-7 and Exhibit C hereto.

            Class A-7 Certificateholder: The registered holder of a Class A-7
Certificate.

            Class A-8 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-8 and Exhibit C hereto.

            Class A-8 Certificateholder: The registered holder of a Class A-8
Certificate.

            Class A-8 Loss Amount: With respect to any Determination Date after
the Subordination Depletion Date, the amount, if any, by which the Principal
Balance of the Class A-8 Certificates would be reduced as a result of the
application of the third sentence of the definition of Principal Balance.

            Class A-9 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-9 and Exhibit C hereto.

             Class A-9 Certificateholder: The registered holder of a Class A-9
Certificate.

            Class A-10 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-10 and Exhibit C hereto.

            Class A-10 Certificateholder: The registered holder of a Class A-10
Certificate.

            Class A-11 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-11 and Exhibit C hereto.

            Class A-11 Certificateholder: The registered holder of a Class A-11
Certificate.

            Class A-11 Pass-Through Rate: With respect to the Distribution Date
occurring in January 2006, 5.290% per annum. With respect to each succeeding
Distribution Date, a per annum rate, determined by the Trustee on the applicable
Rate Determination Date, equal to LIBOR plus 1.000%, subject to a minimum rate
of 1.000% and a maximum rate of 6.750%.

            Class A-12 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-12 and Exhibit C hereto.

            Class A-12 Certificateholder: The registered holder of a Class A-12
Certificate.

            Class A-12 Notional Amount: As to any Distribution Date, an amount
equal to the Principal Balance of the Class A-3 Certificates.

            Class A-12 Pass-Through Rate: With respect to the Distribution Date
occurring in January 2006, 0.100% per annum. With respect to each succeeding
Distribution Date, a per annum rate, determined by the Trustee on the applicable
Rate Determination Date, equal to 5.850% minus LIBOR, subject to a minimum rate
of 0.000% and a maximum rate of 0.100%.

            Class A-13 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-13 and Exhibit C hereto.

            Class A-13 Certificateholder: The registered holder of a Class A-13
Certificate.

            Class A-13 Loss Allocation Amount: With respect to any Determination
Date after the Subordination Depletion Date the lesser of (a) the Principal
Balance of the Class A-13 Certificates with respect to such Determination Date
prior to any reduction for the Class A-13 Loss Allocation Amount and (b) the
Class A-2 Loss Amount.

             Class A-14 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-14 and Exhibit C hereto.

            Class A-14 Certificateholder: The registered holder of a Class A-14
Certificate.

            Class A-15 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-15 and Exhibit C hereto.

            Class A-15 Certificateholder: The registered holder of a Class A-15
Certificate.

            Class A-15 Loss Allocation Amount: With respect to any Determination
Date after the Subordination Depletion Date the lesser of (a) the Principal
Balance of the Class A-15 Certificates with respect to such Determination Date
prior to any reduction for the Class A-15 Loss Allocation Amount and (b) the
Class A-4 Loss Amount.

            Class A-16 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-16 and Exhibit C hereto.

            Class A-16 Certificateholder: The registered holder of a Class A-16
Certificate.

            Class A-17 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-17 and Exhibit C hereto.

            Class A-17 Certificateholder: The registered holder of a Class A-17
Certificate.

            Class A-18 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-18 and Exhibit C hereto.

            Class A-18 Certificateholder: The registered holder of a Class A-18
Certificate.

            Class A-19 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-19 and Exhibit C hereto.

            Class A-19 Certificateholder: The registered holder of a Class A-19
Certificate.

            Class A-19 Loss Allocation Amount: With respect to any Determination
Date after the Subordination Depletion Date the lesser of (a) the Principal
Balance of the Class A-19 Certificates with respect to such Determination Date
prior to any reduction for the Class A-19 Loss Allocation Amount and (b) the
Class A-8 Loss Amount.

            Class A-LR Interest: The residual interest in the Lower-Tier REMIC,
beneficial ownership of which is represented by the Class A-R Certificate.

            Class A-PO Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit A-PO and Exhibit C hereto.

            Class A-PO Certificateholder: The registered holder of a Class A-PO
Certificate.

            Class A-PO Deferred Amount: For any Distribution Date prior to the
Subordination Depletion Date, the difference between (A) the sum of (x) the
amount by which the sum of the Class A-PO Optimal Principal Amounts for all
prior Distribution Dates exceeded the amounts distributed on the Class A-PO
Certificates on such prior Distribution Dates pursuant to Paragraph third clause
(2) of Section 4.01(a) and (y) the sum of the product for each Discount Mortgage
Loan which became a Liquidated Loan at any time on or prior to the last day of
the Applicable Unscheduled Principal Receipt Period for Full Unscheduled
Principal Receipts for the current Distribution Date of (a) the PO Fraction for
such Discount Mortgage Loan and (b) an amount equal to the principal portion of
Realized Losses (other than Bankruptcy Losses due to Debt Service Reductions)
incurred with respect to such Discount Mortgage Loan and (B) the sum of (x) the
sum of the Class A-PO Recoveries for such Distribution Date and prior
Distribution Dates and (y) amounts distributed on the Class A-PO Certificates on
prior Distribution Dates pursuant to Paragraph fourth of Section 4.01(a). On and
after the Subordination Depletion Date, the Class A-PO Deferred Amount will be
zero. No interest will accrue on any Class A-PO Deferred Amount.

            Class A-PO Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Mortgage Loan that is an
Outstanding Mortgage Loan, of the product of (x) the PO Fraction with respect to
such Mortgage Loan and (y) the sum of:

            (i) the principal portion of the Monthly Payment due on the Due Date
      occurring in the month of such Distribution Date on such Mortgage Loan;

            (ii) all Unscheduled Principal Receipts (other than Recoveries) that
      were received by a Servicer with respect to such Mortgage Loan during the
      Applicable Unscheduled Principal Receipt Period relating to such
      Distribution Date for each applicable type of Unscheduled Principal
      Receipt;

            (iii) the Scheduled Principal Balance of each Mortgage Loan which,
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date, was repurchased by the Seller pursuant to
      Section 2.02, 2.03 or 3.08; and

            (iv) the excess of the unpaid principal balance of any Mortgage Loan
      for which a Mortgage Loan was substituted during the one month period
      ending on the day preceding the Determination Date for such Distribution
      Date over the unpaid principal balance of the substituted Mortgage Loan,
      less the amount allocable to the principal portion of any unreimbursed
      Periodic Advances previously made by the applicable Servicer, the Master
      Servicer or the Trustee in respect of such Mortgage Loan for which a
      Mortgage Loan was substituted; and

      (II) the Class A-PO Recovery for such Distribution Date.

            Class A-PO Recovery: As to any Distribution Date prior to the
Subordination Depletion Date, the lesser of (a) the Class A-PO Deferred Amount
for such Distribution Date (calculated without regard to the Class A-PO Recovery
for such Distribution Date) and (b) an amount equal to the sum as to each
Mortgage Loan as to which there has been a Recovery during the Applicable
Unscheduled Principal Receipt Period, of the product of (x) the PO Fraction with
respect to such Mortgage Loan and (y) the amount of the Recovery with respect to
such Mortgage Loan. As to any Distribution Date on or after the Subordination
Depletion Date, the amount determined in accordance with clause (b) above.

            Class A-R Certificate: The Certificate executed by the Trustee and
authenticated by the Trustee or the Authenticating Agent in substantially the
form set forth in Exhibit A-R and Exhibit C hereto.

            Class A-R Certificateholder: The registered holder of the Class A-R
Certificate.

            Class A-R Interest: The residual interest in the Upper-Tier REMIC,
beneficial ownership of which is evidenced by the Class A-R Certificate.

            Class B Certificate: Any one of the Class B-1 Certificates, Class
B-2 Certificates, Class B-3 Certificates, Class B-4 Certificates, Class B-5
Certificates or Class B-6 Certificates.

            Class B Certificateholder: The registered holder of a Class B
Certificate.

            Class B Distribution Amount: Any of the Class B-1, Class B-2, Class
B-3, Class B-4, Class B-5 and Class B-6 Distribution Amounts.

            Class B Interest Accrual Amount: With respect to any Distribution
Date, the sum of the Interest Accrual Amounts for the Classes of Class B
Certificates with respect to such Distribution Date.

            Class B Interest Percentage: With respect to any Distribution Date
and any Class of Class B Certificates, the percentage calculated by dividing the
Interest Accrual Amount of such Class (determined without regard to clause (ii)
of the definition thereof) by the Class B Interest Accrual Amount (determined
without regard to clause (ii) of the definition of each Interest Accrual
Amount).

            Class B Interest Shortfall Amount: Any of the Class B-1 Interest
Shortfall Amount, Class B-2 Interest Shortfall Amount, Class B-3 Interest
Shortfall Amount, Class B-4 Interest Shortfall Amount, Class B-5 Interest
Shortfall Amount or Class B-6 Interest Shortfall Amount.

            Class B Loss Percentage: With respect to any Determination Date and
any Class of Class B Certificates then outstanding, the percentage calculated by
dividing the Principal Balance of such Class B Certificates by the Class B
Principal Balance (determined without regard to any Principal Balance of any
Class of Class B Certificates not then outstanding), in each case determined as
of the preceding Determination Date.

             Class B Optimal Principal Amount: Any of the Class B-1, Class B-2,
Class B-3, Class B-4, Class B-5 or Class B-6 Optimal Principal Amounts.

            Class B Pass-Through Rate: As to any Distribution Date, a per annum
rate equal to 5.500%.

             Class B Percentage: Any one of the Class B-1 Percentage, Class B-2
Percentage, Class B-3 Percentage, Class B-4 Percentage, Class B-5 Percentage or
Class B-6 Percentage.

            Class B Prepayment Percentage: Any of the Class B-1 Prepayment
Percentage, Class B-2 Prepayment Percentage, Class B-3 Prepayment Percentage,
Class B-4 Prepayment Percentage, Class B-5 Prepayment Percentage or Class B-6
Prepayment Percentage.

            Class B Principal Balance: As of any date, an amount equal to the
sum of the Class B-1 Principal Balance, Class B-2 Principal Balance, Class B-3
Principal Balance, Class B-4 Principal Balance, Class B-5 Principal Balance and
Class B-6 Principal Balance.

            Class B Unpaid Interest Shortfall: Any of the Class B-1 Unpaid
Interest Shortfall, Class B-2 Unpaid Interest Shortfall, Class B-3 Unpaid
Interest Shortfall, Class B-4 Unpaid Interest Shortfall, Class B-5 Unpaid
Interest Shortfall or Class B-6 Unpaid Interest Shortfall.

            Class B-1 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-1 and Exhibit C hereto.

            Class B-1 Certificateholder: The registered holder of a Class B-1
Certificate.

            Class B-1 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-1 Certificates pursuant to
Paragraphs fifth, sixth and seventh of Section 4.01(a).

            Class B-1 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-1 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-1 Certificates on such Distribution Date pursuant to Paragraph
fifth of Section 4.01(a).

            Class B-1 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

            (i) the Class B-1 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

             (ii) the Class B-1 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-1 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-1 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-1 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-1 Optimal Principal Amount
will equal the lesser of (A) the Class B-1 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-1 Certificates.

            Class B-1 Percentage: As to any Distribution Date, the percentage
calculated by multiplying the Subordinated Percentage by either (i) if any Class
B Certificates (other than the Class B-1 Certificates) are eligible to receive
principal distributions for such Distribution Date in accordance with Section
4.01(d), a fraction, the numerator of which is the Class B-1 Principal Balance
(determined as of the Determination Date preceding such Distribution Date) and
the denominator of which is the sum of the Principal Balances of the Classes of
Class B Certificates eligible to receive principal distributions for such
Distribution Date in accordance with the provisions of Section 4.01(d) or (ii)
except as set forth in Section 4.01(d)(ii), in the event that the Class B
Certificates (other than the Class B-1 Certificates) are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), one.

            Class B-1 Prepayment Percentage: As to any Distribution Date, the
percentage calculated by multiplying the Subordinated Prepayment Percentage by
either (i) if any Class B Certificates (other than the Class B-1 Certificates)
are eligible to receive principal distributions for such Distribution Date in
accordance with Section 4.01(d), a fraction, the numerator of which is the Class
B-1 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d) or (ii) except as set forth in Section 4.01(d)(ii), in the event
that the Class B Certificates (other than the Class B-1 Certificates) are not
eligible to receive distributions of principal in accordance with Section
4.01(d)(i), one.

            Class B-1 Principal Balance: As to the first Determination Date, the
Original Class B-1 Principal Balance. As of any subsequent Determination Date,
the Original Class B-1 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-1 Certificates on prior Distribution Dates
(A) pursuant to Paragraph seventh of Section 4.01(a) (including any principal
otherwise payable to the Class B-1 Certificates used to pay any Class A-PO
Deferred Amounts) and (B) as a result of a Principal Adjustment; provided,
however, if the Class B-1 Certificates are the most subordinate Certificates
outstanding, the Class B-1 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the Class A Non-PO Principal Balance as of such
Determination Date.

            Class B-1 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-1 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-1 Certificates on prior Distribution Dates pursuant to
Paragraph sixth of Section 4.01(a).

            Class B-2 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-2 and Exhibit C hereto.

            Class B-2 Certificateholder: The registered holder of a Class B-2
Certificate.

            Class B-2 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-2 Certificates pursuant to
Paragraphs eighth, ninth and tenth of Section 4.01(a).

            Class B-2 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-2 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-2 Certificates on such Distribution Date pursuant to Paragraph
eighth of Section 4.01(a).

            Class B-2 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

            (i) the Class B-2 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

            (ii) the Class B-2 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-2 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-2 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
       substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-2 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-2 Optimal Principal Amount
will equal the lesser of (A) the Class B-2 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-2 Certificates.

            Class B-2 Percentage: As to any Distribution Date, except as set
forth in the next sentence, the percentage calculated by multiplying (i) the
Subordinated Percentage by (ii) a fraction, the numerator of which is the Class
B-2 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d). Except as set forth in Section 4.01(d)(ii), in the event that
the Class B-2 Certificates are not eligible to receive distributions of
principal in accordance with Section 4.01(d)(i), the Class B-2 Percentage for
such Distribution Date will be zero.

            Class B-2 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence, the percentage calculated by multiplying (i)
the Subordinated Prepayment Percentage by (ii) a fraction, the numerator of
which is the Class B-2 Principal Balance (determined as of the Determination
Date preceding such Distribution Date) and the denominator of which is the sum
of the Principal Balances of the Classes of Class B Certificates eligible to
receive principal distributions for such Distribution Date in accordance with
the provisions of Section 4.01(d). Except as set forth in Section 4.01(d)(ii),
in the event that the Class B-2 Certificates are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), the Class B-2
Prepayment Percentage for such Distribution Date will be zero.

            Class B-2 Principal Balance: As to the first Determination Date, the
Original Class B-2 Principal Balance. As of any subsequent Determination Date,
the Original Class B-2 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-2 Certificates on prior Distribution Dates
(A) pursuant to Paragraph tenth of Section 4.01(a) (including any principal
otherwise payable to the Class B-2 Certificates used to pay any Class A-PO
Deferred Amounts) and (B) as a result of a Principal Adjustment; provided,
however, if the Class B-2 Certificates are the most subordinate Certificates
outstanding, the Class B-2 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the sum of the Class A Non-PO Principal Balance and the
Class B-1 Principal Balance as of such Determination Date.

             Class B-2 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-2 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-2 Certificates on prior Distribution Dates pursuant to
Paragraph ninth of Section 4.01(a).

            Class B-3 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-3 and Exhibit C hereto.

            Class B-3 Certificateholder: The registered holder of a Class B-3
Certificate.

            Class B-3 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-3 Certificates pursuant to
Paragraphs eleventh, twelfth and thirteenth of Section 4.01(a).

            Class B-3 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-3 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-3 Certificates on such Distribution Date pursuant to Paragraph
eleventh of Section 4.01(a).

            Class B-3 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

            (i) the Class B-3 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

            (ii) the Class B-3 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-3 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-3 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
       applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-3 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-3 Optimal Principal Amount
will equal the lesser of (A) the Class B-3 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-3 Certificates.

            Class B-3 Percentage: As to any Distribution Date, except as set
forth in the next sentence, the percentage calculated by multiplying (i) the
Subordinated Percentage by (ii) a fraction, the numerator of which is the Class
B-3 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d). Except as set forth in Section 4.01(d)(ii), in the event that
the Class B-3 Certificates are not eligible to receive distributions of
principal in accordance with Section 4.01(d)(i), the Class B-3 Percentage for
such Distribution Date will be zero.

            Class B-3 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence, the percentage calculated by multiplying (i)
the Subordinated Prepayment Percentage by (ii) a fraction, the numerator of
which is the Class B-3 Principal Balance (determined as of the Determination
Date preceding such Distribution Date) and the denominator of which is the sum
of the Principal Balances of the Classes of Class B Certificates eligible to
receive principal distributions for such Distribution Date in accordance with
the provisions of Section 4.01(d). Except as set forth in Section 4.01(d)(ii),
in the event that the Class B-3 Certificates are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), the Class B-3
Prepayment Percentage for such Distribution Date will be zero.

            Class B-3 Principal Balance: As to the first Determination Date, the
Original Class B-3 Principal Balance. As of any subsequent Determination Date,
the Original Class B-3 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-3 Certificates on prior Distribution Dates
(A) pursuant to Paragraph thirteenth of Section 4.01(a) (including any principal
otherwise payable to the Class B-3 Certificates used to pay any Class A-PO
Deferred Amounts) and (B) as a result of a Principal Adjustment; provided,
however, if the Class B-3 Certificates are the most subordinate Certificates
outstanding, the Class B-3 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the sum of the Class A Non-PO Principal Balance, the
Class B-1 Principal Balance and the Class B-2 Principal Balance as of such
Determination Date.

            Class B-3 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-3 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-3 Certificates on prior Distribution Dates pursuant to
Paragraph twelfth of Section 4.01(a).

            Class B-4 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-4 and Exhibit C hereto.

            Class B-4 Certificateholder: The registered holder of a Class B-4
Certificate.

            Class B-4 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-4 Certificates pursuant to
Paragraphs fourteenth, fifteenth and sixteenth of Section 4.01(a).

            Class B-4 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-4 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-4 Certificates on such Distribution Date pursuant to Paragraph
fourteenth of Section 4.01(a).

            Class B-4 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

            (i) the Class B-4 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
       Date on such Mortgage Loan;

            (ii) the Class B-4 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-4 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-4 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-4 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-4 Optimal Principal Amount
will equal the lesser of (A) the Class B-4 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-4 Certificates.

            Class B-4 Percentage: As to any Distribution Date, except as set
forth in the next sentence, the percentage calculated by multiplying (i) the
Subordinated Percentage by (ii) a fraction, the numerator of which is the Class
B-4 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d). Except as set forth in Section 4.01(d)(ii), in the event that
the Class B-4 Certificates are not eligible to receive distributions of
principal in accordance with Section 4.01(d)(i), the Class B-4 Percentage for
such Distribution Date will be zero.

            Class B-4 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence, the percentage calculated by multiplying (i)
the Subordinated Prepayment Percentage by (ii) a fraction, the numerator of
which is the Class B-4 Principal Balance (determined as of the Determination
Date preceding such Distribution Date) and the denominator of which is the sum
of the Principal Balances of the Classes of Class B Certificates eligible to
receive principal distributions for such Distribution Date in accordance with
the provisions of Section 4.01(d). Except as set forth in Section 4.01(d)(ii),
in the event that the Class B-4 Certificates are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), the Class B-4
Prepayment Percentage for such Distribution Date will be zero.

            Class B-4 Principal Balance: As to the first Determination Date, the
Original Class B-4 Principal Balance. As of any subsequent Determination Date,
the Original Class B-4 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-4 Certificates on prior Distribution Dates
(A) pursuant to Paragraph sixteenth of Section 4.01(a) (including any principal
otherwise payable to the Class B-4 Certificates used to pay any Class A-PO
Deferred Amounts) and (B) as a result of a Principal Adjustment; provided,
however, if the Class B-4 Certificates are the most subordinate Certificates
outstanding, the Class B-4 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the sum of the Class A Non-PO Principal Balance, the
Class B-1 Principal Balance, the Class B-2 Principal Balance and the Class B-3
Principal Balance as of such Determination Date.

            Class B-4 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-4 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-4 Certificates on prior Distribution Dates pursuant to
Paragraph fifteenth of Section 4.01(a).

            Class B-5 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-5 and Exhibit C hereto.

            Class B-5 Certificateholder: The registered holder of a Class B-5
Certificate.

            Class B-5 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-5 Certificates pursuant to
Paragraphs seventeenth, eighteenth and nineteenth of Section 4.01(a).

            Class B-5 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-5 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-5 Certificates on such Distribution Date pursuant to Paragraph
seventeenth of Section 4.01(a).

            Class B-5 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

            (i) the Class B-5 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

            (ii) the Class B-5 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-5 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-5 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-5 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-5 Optimal Principal Amount
will equal the lesser of (A) the Class B-5 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-5 Certificates.

            Class B-5 Percentage: As to any Distribution Date, except as set
forth in the next sentence, the percentage calculated by multiplying (i) the
Subordinated Percentage by (ii) a fraction, the numerator of which is the Class
B-5 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d). Except as set forth in Section 4.01(d)(ii), in the event that
the Class B-5 Certificates are not eligible to receive distributions of
principal in accordance with Section 4.01(d)(i), the Class B-5 Percentage for
such Distribution Date will be zero.

            Class B-5 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence, the percentage calculated by multiplying (i)
the Subordinated Prepayment Percentage by (ii) a fraction, the numerator of
which is the Class B-5 Principal Balance (determined as of the Determination
Date preceding such Distribution Date) and the denominator of which is the sum
of the Principal Balances of the Classes of Class B Certificates eligible to
receive principal distributions for such Distribution Date in accordance with
the provisions of Section 4.01(d). Except as set forth in Section 4.01(d)(ii),
in the event that the Class B-5 Certificates are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), the Class B-5
Prepayment Percentage for such Distribution Date will be zero.

            Class B-5 Principal Balance: As to the first Determination Date, the
Original Class B-5 Principal Balance. As of any subsequent Determination Date,
the Original Class B-5 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-5 Certificates on prior Distribution Dates
(A) pursuant to Paragraph nineteenth of Section 4.01(a) (including any principal
otherwise payable to the Class B-5 Certificates used to pay any Class A-PO
Deferred Amounts) and (B) as a result of a Principal Adjustment; provided,
however, if the Class B-5 Certificates are the most subordinate Certificates
outstanding, the Class B-5 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the sum of the Class A Non-PO Principal Balance, the
Class B-1 Principal Balance, the Class B-2 Principal Balance, the Class B-3
Principal Balance and the Class B-4 Principal Balance as of such Determination
Date.

            Class B-5 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-5 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-5 Certificates on prior Distribution Dates pursuant to
Paragraph eighteenth of Section 4.01(a).

            Class B-6 Certificate: Any one of the Certificates executed by the
Trustee and authenticated by the Trustee or the Authenticating Agent in
substantially the form set forth in Exhibit B-6 and Exhibit C hereto.

            Class B-6 Certificateholder: The registered holder of a Class B-6
Certificate.

            Class B-6 Distribution Amount: As to any Distribution Date, any
amount distributable to the Holders of the Class B-6 Certificates pursuant to
Paragraphs twentieth, twenty-first and twenty-second of Section 4.01(a).

            Class B-6 Interest Shortfall Amount: As to any Distribution Date,
any amount by which the Interest Accrual Amount of the Class B-6 Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-6 Certificates on such Distribution Date pursuant to Paragraph
twentieth of Section 4.01(a).

             Class B-6 Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of
the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and
(y) the sum of:

             (i) the Class B-6 Percentage of the principal portion of the Monthly
      Payment due on the Due Date occurring in the month of such Distribution
      Date on such Mortgage Loan;

            (ii) the Class B-6 Prepayment Percentage of all Unscheduled
      Principal Receipts (other than Recoveries) that were received by a
      Servicer with respect to such Mortgage Loan during the Applicable
      Unscheduled Principal Receipt Period relating to such Distribution Date
      for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class B-6 Prepayment Percentage of the Scheduled Principal
      Balance of such Mortgage Loan which, during the one month period ending on
      the day preceding the Determination Date for such Distribution Date, was
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08; and

            (iv) the Class B-6 Percentage of the excess of the unpaid principal
      balance of any Mortgage Loan for which a Mortgage Loan was substituted
      during the one month period ending on the day preceding the Determination
      Date for such Distribution Date over the unpaid principal balance of the
      substituted Mortgage Loan, less the amount allocable to the principal
      portion of any unreimbursed Periodic Advances previously made by the
      applicable Servicer, the Master Servicer or the Trustee in respect of such
      Mortgage Loan for which a Mortgage Loan was substituted; and

      (II) the Class B-6 Prepayment Percentage of the Non-PO Recovery for such
      Distribution Date;

provided, however, that if an Optimal Adjustment Event occurs with respect to
such Class and such Distribution Date, the Class B-6 Optimal Principal Amount
will equal the lesser of (A) the Class B-6 Optimal Principal Amount calculated
as described in the preceding provisions and (B) the Adjusted Principal Balance
for the Class B-6 Certificates.

            Class B-6 Percentage: As to any Distribution Date, except as set
forth in the next sentence, the percentage calculated by multiplying (i) the
Subordinated Percentage by (ii) a fraction, the numerator of which is the Class
B-6 Principal Balance (determined as of the Determination Date preceding such
Distribution Date) and the denominator of which is the sum of the Principal
Balances of the Classes of Class B Certificates eligible to receive principal
distributions for such Distribution Date in accordance with the provisions of
Section 4.01(d). Except as set forth in Section 4.01(d)(ii), in the event that
the Class B-6 Certificates are not eligible to receive distributions of
principal in accordance with Section 4.01(d)(i), the Class B-6 Percentage for
such Distribution Date will be zero.

            Class B-6 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence, the percentage calculated by multiplying (i)
the Subordinated Prepayment Percentage by (ii) a fraction, the numerator of
which is the Class B-6 Principal Balance (determined as of the Determination
Date preceding such Distribution Date) and the denominator of which is the sum
of the Principal Balances of the Classes of Class B Certificates eligible to
receive principal distributions for such Distribution Date in accordance with
the provisions of Section 4.01(d). Except as set forth in Section 4.01(d)(ii),
in the event that the Class B-6 Certificates are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), the Class B-6
Prepayment Percentage for such Distribution Date will be zero.

            Class B-6 Principal Balance: As to the first Determination Date, the
Original Class B-6 Principal Balance. As of any subsequent Determination Date,
the Original Class B-6 Principal Balance less the sum of all amounts previously
distributed in respect of the Class B-6 Certificates on prior Distribution Dates
pursuant to Paragraph twenty-second of Section 4.01(a) (including any principal
otherwise payable to the Class B-6 Certificates used to pay any Class A-PO
Deferred Amounts); provided, however, if the Class B-6 Certificates are
outstanding, the Class B-6 Principal Balance will equal the difference, if any,
between the Adjusted Pool Amount (Non-PO Portion) as of the preceding
Distribution Date less the sum of the Class A Non-PO Principal Balance, the
Class B-1 Principal Balance, the Class B-2 Principal Balance, the Class B-3
Principal Balance, the Class B-4 Principal Balance and the Class B-5 Principal
Balance as of such Determination Date.

            Class B-6 Unpaid Interest Shortfall: As to any Distribution Date,
the amount, if any, by which the aggregate of the Class B-6 Interest Shortfall
Amounts for prior Distribution Dates is in excess of the amounts distributed in
respect of the Class B-6 Certificates on prior Distribution Dates pursuant to
Paragraph twenty-first of Section 4.01(a).

            Clearing Agency: An organization registered as a "clearing agency"
pursuant to Section 17A of the Exchange Act. The initial Clearing Agency shall
be The Depository Trust Company.

             Clearing Agency Indirect Participant: A broker, dealer, bank,
financial institution or other Person that clears securities transactions
through or maintains a custodial relationship with a Clearing Agency
Participant, either directly or indirectly.

            Clearing Agency Participant: A broker, dealer, bank, financial
institution or other Person for whom a Clearing Agency effects book-entry
transfers of securities deposited with the Clearing Agency.

            Closing Date: The date of initial issuance of the Certificates, as
set forth in Section 11.19.

            Code: The Internal Revenue Code of 1986, as it may be amended from
time to time, any successor statutes thereto, and applicable U.S. Department of
the Treasury temporary or final regulations promulgated thereunder.

            Compensating Interest: With respect to any Distribution Date, the
least of (a) the aggregate Prepayment Interest Shortfall on the Mortgage Loans
for such Distribution Date, (b) the product of (i) 1/12th of 0.20% and (ii) the
Pool Scheduled Principal Balance for such Distribution Date and (c) the
Available Master Servicing Compensation for such Distribution Date.

            Co-op Shares: Shares issued by private non-profit housing
corporations.

            Corporate Trust Office: The principal office of the Trustee at which
at any particular time its corporate trust business shall be administered, which
office, at the date of the execution of this instrument, is located at 401 South
Tryon Street, Charlotte, North Carolina 28288.

            Corresponding Upper-Tier Class or Classes: As to the following
Uncertificated Lower-Tier Interests, the Corresponding Upper-Tier Class or
Classes as follows:

Uncertificated Lower-Tier Interest    Corresponding Upper-Tier Class or Classes
----------------------------------    -----------------------------------------

Class A-L1 Interest                   Class A-1 Certificates and the Premium
                                     Payment

Class A-L2 Interest                   Class A-2 and Class A-7 Certificates

Class A-L3 Interest                   Class A-3, Class A-5, Class A-11 and Class
                                     A-12 Certificates

Class A-L4 Interest                   Class A-4, Class A-6, Class A-8, Class A-9,
                                      Class A-10, Class A-13, Class A-15,
                                     Class A-16, Class A-17 and Class A-19
                                     Certificates

Class A-L14 Interest                  Class A-14 Certificates
Class A-L18 Interest                  Class A-18 Certificates
Class A-LPO Interest                  Class A-PO Certificates
Class A-LUR Interest                  Class A-R Certificate
Class B-L1 Interest                   Class B-1 Certificates
Class B-L2 Interest                   Class B-2 Certificates
Class B-L3 Interest                   Class B-3 Certificates
Class B-L4 Interest                   Class B-4 Certificates
Class B-L5 Interest                   Class B-5 Certificates
Class B-L6 Interest                    Class B-6 Certificates

            The Premium Payment (i) shall be payable from the Upper-Tier REMIC
and (ii) shall be deemed to be a "Corresponding Upper-Tier Class" (corresponding
to the Class A-L1 Interest) for purposes of this definition.

             Credit Suisse: Credit Suisse First Boston LLC, or its successor in
interest.

            Current Class A Interest Distribution Amount: As to any Distribution
Date, the amount distributed in respect of the Classes of Class A Certificates
and the Premium Payment pursuant to Paragraph first of Section 4.01(a) on such
Distribution Date.

            Current Class B Interest Distribution Amount: As to any Distribution
Date, the amount distributed in respect of the Classes of Class B Certificates
pursuant to Paragraphs fifth, eighth, eleventh, fourteenth, seventeenth and
twentieth of Section 4.01(a) on such Distribution Date.

            Current Class B-1 Fractional Interest: As to any Distribution Date
subsequent to the first Distribution Date, the percentage obtained by dividing
the sum of the Principal Balances of the Class B-2, Class B-3, Class B-4, Class
B-5 and Class B-6 Certificates by the Aggregate Non-PO Principal Balance. As to
the first Distribution Date, the Original Class B-1 Fractional Interest.

            Current Class B-2 Fractional Interest: As to any Distribution Date
subsequent to the first Distribution Date, the percentage obtained by dividing
the sum of the Principal Balances of the Class B-3, Class B-4, Class B-5 and
Class B-6 Certificates by the Aggregate Non-PO Principal Balance. As to the
first Distribution Date, the Original Class B-2 Fractional Interest.

            Current Class B-3 Fractional Interest: As to any Distribution Date
subsequent to the first Distribution Date, the percentage obtained by dividing
the sum of the Principal Balances of the Class B-4, Class B-5 and Class B-6
Certificates by the Aggregate Non-PO Principal Balance. As to the first
Distribution Date, the Original Class B-3 Fractional Interest.

             Current Class B-4 Fractional Interest: As to any Distribution Date
subsequent to the first Distribution Date, the percentage obtained by dividing
the sum of the Principal Balances of the Class B-5 and Class B-6 Certificates by
the Aggregate Non-PO Principal Balance. As to the first Distribution Date, the
Original Class B-4 Fractional Interest.

            Current Class B-5 Fractional Interest: As to any Distribution Date
subsequent to the first Distribution Date, the percentage obtained by dividing
the Principal Balance of the Class B-6 Certificates by the Aggregate Non-PO
Principal Balance. As to the first Distribution Date, the Original Class B-5
Fractional Interest.

            Curtailment: Any Principal Prepayment made by a Mortgagor which is
not a Prepayment in Full.

            Curtailment Interest Shortfall: On any Distribution Date with
respect to a Mortgage Loan which was the subject of a Curtailment:

            (A)    in the case where the Applicable Unscheduled Principal Receipt
                   Period is the Mid-Month Receipt Period and such Curtailment is
                  received by the Servicer on or after the Determination Date in
                  the month preceding the month of such Distribution Date but
                  prior to the first day of the month of such Distribution Date,
                  the amount of interest that would have accrued at the Net
                  Mortgage Interest Rate on the amount of such Curtailment from
                  the day of its receipt or, if earlier, its application by the
                  Servicer through the last day of the month preceding the month
                  of such Distribution Date; and

            (B)    in the case where the Applicable Unscheduled Principal Receipt
                   Period is the Prior Month Receipt Period and such Curtailment
                  is received by the Servicer during the month preceding the
                  month of such Distribution Date, the amount of interest that
                  would have accrued at the Net Mortgage Interest Rate on the
                  amount of such Curtailment from the day of its receipt or, if
                  earlier, its application by the Servicer through the last day
                  of the month in which such Curtailment is received.

            Custodial Agreement: The Custodial Agreement, dated as of December
22, 2005, among the Custodian, the Seller, the Master Servicer and the Trustee,
which agreement is attached hereto as Exhibit E, as the same may be amended or
modified from time to time in accordance with the terms thereof.

            Custodial P&I Account: The Custodial P&I Account, as defined in each
of the Servicing Agreements, with respect to the Mortgage Loans. In determining
whether the Custodial P&I Account under any Servicing Agreement is "acceptable"
to the Master Servicer (as may be required by the definition of "Eligible
Account" contained in the Servicing Agreements), the Master Servicer shall
require that any such account shall be acceptable to each of the Rating
Agencies.

            Custodian: Wells Fargo Bank, or its successor in interest under the
Custodial Agreement. Initially, the custodial functions shall be performed by
the Corporate Trust Services division of Wells Fargo Bank.

             Cut-Off Date: The first day of the month of initial issuance of the
Certificates as set forth in Section 11.01.

            Cut-Off Date Aggregate Principal Balance: The aggregate of the
Cut-Off Date Principal Balances of the Mortgage Loans as set forth in Section
11.02.

            Cut-Off Date Principal Balance: As to each Mortgage Loan, its unpaid
principal balance as of the close of business on the Cut-Off Date (but without
giving effect to any Unscheduled Principal Receipts received or applied on the
Cut-Off Date), reduced by all payments of principal due on or before the Cut-Off
Date and not paid, and increased by scheduled monthly payments of principal due
after the Cut-Off Date but received by the related Servicer on or before the
Cut-Off Date.

            Debt Service Reduction: With respect to any Mortgage Loan, a
reduction in the scheduled Monthly Payment for such Mortgage Loan by a court of
competent jurisdiction in a proceeding under the Bankruptcy Code, except such a
reduction constituting a Deficient Valuation.

            Deceased Holder: A Beneficial Owner of a Class A-1 Certificate who
was living at the time such interest was acquired, whose death is deemed to have
occurred pursuant to Section 4.07(b), and with respect to which the Trustee has
received through the Clearing Agency evidence of death satisfactory to the
Trustee and any tax waivers requested by the Trustee.

            Deficiency Amount: With respect to the Class A-1 Certificates on
each Distribution Date, the sum of (i) the Class A-1 Interest Loss Amount for
such Distribution Date and (ii) the Class A-1 Principal Loss Amount for such
Distribution Date.

            Deficient Valuation: With respect to any Mortgage Loan, a valuation
by a court of competent jurisdiction of the Mortgaged Property in an amount less
than the then-outstanding indebtedness under the Mortgage Loan, or any reduction
in the amount of principal to be paid in connection with any scheduled Monthly
Payment that results in a permanent forgiveness of principal, which valuation or
reduction results from a proceeding under the Bankruptcy Code.

            Definitive Certificates: As defined in Section 5.01(b).

            Denomination: The amount, if any, specified on the face of each
Certificate (other than the Interest Only Certificates) representing the
principal portion of the Cut-Off Date Aggregate Principal Balance evidenced by
such Certificate. As to the Interest Only Certificates, the amount specified on
the face of each such Certificate representing the portion of the Original
Notional Amount.

            Determination Date: The 17th day of the month in which the related
Distribution Date occurs, or if such 17th day is not a Business Day, the
Business Day preceding such 17th day.

            Discount Mortgage Loan: A Mortgage Loan with a Net Mortgage Interest
Rate of less than 5.500%.

            Distribution Date: The 25th day of any month, beginning in the month
following the month of initial issuance of the Certificates, or if such 25th day
is not a Business Day, the Business Day following such 25th day.

            Distribution Date Statement: As defined in Section 4.04(a).

            Document Transfer Event: The 60th day following the day on which
either (i) Wells Fargo Bank is no longer the Servicer of any of the Mortgage
Loans or (ii) the senior, unsecured long-term debt rating of Wells Fargo &
Company is less than "BBB-" by Fitch.

            Due Date: With respect to any Mortgage Loan, the day of the month in
which the Monthly Payment on such Mortgage Loan is scheduled to be paid.

            Eligible Account: One or more accounts (i) that are maintained with
a depository institution (which may be the Master Servicer) whose long-term debt
obligations (or, in the case of a depository institution which is part of a
holding company structure, the long-term debt obligations of such parent holding
company) at the time of deposit therein are rated at least "AA" (or the
equivalent) by each Rating Agency, (ii) the deposits in which are fully insured
by the FDIC through either the Bank Insurance Fund or the Savings Association
Insurance Fund, (iii) the deposits in which are insured by the FDIC through
either the Bank Insurance Fund or the Savings Association Insurance Fund (to the
limit established by the FDIC) and the uninsured deposits in which accounts are
otherwise secured, as evidenced by an Opinion of Counsel delivered to the
Trustee, such that the Trustee, on behalf of the Certificateholders has a claim
with respect to the funds in such accounts or a perfected first security
interest against any collateral securing such funds that is superior to claims
of any other depositors or creditors of the depository institution with which
such accounts are maintained, (iv) that are trust accounts maintained with the
trust department of a federal or state chartered depository institution or trust
company acting in its fiduciary capacity or (v) such other account that is
acceptable to each of the Rating Agencies and would not cause the Trust Estate
to fail to qualify as two separate REMICs or result in the imposition of any
federal tax on either of the Upper-Tier REMIC or the Lower-Tier REMIC.

            Eligible Investments: At any time, any one or more of the following
obligations and securities which shall mature not later than the Business Day
preceding the Distribution Date next succeeding the date of such investment,
provided that such investments continue to qualify as "cash flow investments" as
defined in Code Section 860G(a)(6):

            (i) obligations of the United States of America or any agency
      thereof, provided such obligations are backed by the full faith and credit
      of the United States of America;

            (ii) general obligations of or obligations guaranteed by any state
      of the United States of America or the District of Columbia receiving the
      highest short-term or highest long-term rating of each Rating Agency, or
      such lower rating as would not result in the downgrading or withdrawal of
      the rating then assigned to any of the Certificates by either Rating
      Agency or result in any of such rated Certificates being placed on credit
      review status (other than for possible upgrading) (determined in the case
      of the Class A-1 Certificates, without giving effect to the guaranty
      provided by MBIA) by either Rating Agency;

            (iii) commercial or finance company paper which is then rated in the
      highest long-term commercial or finance company paper rating category of
      each Rating Agency or the highest short-term rating category of each
      Rating Agency, or such lower rating category as would not result in the
      downgrading or withdrawal of the rating then assigned to any of the
      Certificates by either Rating Agency or result in any of such rated
      Certificates being placed on credit review status (other than for possible
      upgrading) (determined in the case of the Class A-1 Certificates, without
      giving effect to the guaranty provided by MBIA) by either Rating Agency;

            (iv) certificates of deposit, demand or time deposits, federal funds
      or banker's acceptances issued by any depository institution or trust
      company incorporated under the laws of the United States or of any state
      thereof and subject to supervision and examination by federal and/or state
      banking authorities, provided that the commercial paper and/or debt
      obligations of such depository institution or trust company (or in the
      case of the principal depository institution in a holding company system,
      the commercial paper or debt obligations of such holding company) are then
      rated in the highest short-term or the highest long-term rating category
      for such securities of each of the Rating Agencies, or such lower rating
      categories as would not result in the downgrading or withdrawal of the
      rating then assigned to any of the Certificates by either Rating Agency or
      result in any of such rated Certificates being placed on credit review
      status (other than for possible upgrading) (determined in the case of the
      Class A-1 Certificates, without giving effect to the guaranty provided by
      MBIA) by either Rating Agency;

            (v) guaranteed reinvestment agreements issued by any bank, insurance
      company or other corporation acceptable to each Rating Agency at the time
      of the issuance of such agreements;

            (vi) repurchase agreements on obligations with respect to any
      security described in clauses (i) or (ii) above or any other security
      issued or guaranteed by an agency or instrumentality of the United States
      of America, in either case entered into with a depository institution or
      trust company (acting as principal) described in (iv) above;

            (vii) securities (other than stripped bonds or stripped coupon
      securities) bearing interest or sold at a discount issued by any
      corporation incorporated under the laws of the United States of America or
      any state thereof which, at the time of such investment or contractual
      commitment providing for such investment, are then rated in the highest
      short-term or the highest long-term rating category by each Rating Agency,
      or in such lower rating category as would not result in the downgrading or
      withdrawal of the rating then assigned to any of the Certificates by
      either Rating Agency or result in any of such rated Certificates being
      placed on credit review status (other than for possible upgrading)
      (determined in the case of the Class A-1 Certificates, without giving
      effect to the guaranty provided by MBIA) by either Rating Agency;

            (viii) such other investments acceptable to each Rating Agency as
      would not result in the downgrading of the rating then assigned to the
      Certificates by either Rating Agency or result in any of such rated
      Certificates being placed on credit review status (other than for possible
      upgrading) (determined in the case of the Class A-1 Certificates, without
      giving effect to the guaranty provided by MBIA) by either Rating Agency;
      and

            (ix) any mutual fund, money market fund, common trust fund or other
      pooled investment vehicle, the assets of which are limited to instruments
      that otherwise would constitute Eligible Investments hereunder, including
      any such fund that is managed by the Trustee or Master Servicer or any
      affiliate of the Trustee or Master Servicer or for which the Trustee or
      Master Servicer or any of its affiliates acts as an adviser as long as
      such fund is rated in at least the highest rating category by each Rating
      Agency.

            In no event shall an instrument be an Eligible Investment if such
instrument evidences either (i) a right to receive only interest payments with
respect to the obligations underlying such instrument, or (ii) both principal
and interest payments derived from obligations underlying such instrument and
the interest and principal payments with respect to such instrument provide a
yield to maturity at the date of investment of greater than 120% of the yield to
maturity at par of such underlying obligations.

            ERISA: The Employee Retirement Income Security Act of 1974, as
amended.

            ERISA Prohibited Holder: As defined in Section 5.02(d).

            Errors and Omissions Policy: As defined in each of the Servicing
Agreements.

            Event of Default: Any of the events specified in Section 7.01.

            Exchange Act: The Securities Exchange Act of 1934, as amended.

            FDIC: The Federal Deposit Insurance Corporation or any successor
thereto.

            Fidelity Bond: As defined in each of the Servicing Agreements.

            Final Distribution Date: The Distribution Date on which the final
distribution in respect of the Certificates is made pursuant to Section 9.01.

            Final Scheduled Maturity Date: The Final Scheduled Maturity Date for
each Class of Class A Certificates and Class B Certificates is January 25, 2036,
which corresponds to the "latest possible maturity date" for purposes of Section
860G(a)(1) of the Internal Revenue Code of 1986, as amended.

            Fitch: Fitch Ratings, or its successor in interest.

            Fixed Retained Yield: The fixed percentage of interest on each
Mortgage Loan with a Mortgage Interest Rate greater than the sum of (a) 5.500%,
(b) the applicable Servicing Fee Rate and (c) the Master Servicing Fee Rate,
which will be determined on a loan by loan basis and will equal the Mortgage
Interest Rate on each Mortgage Loan minus the sum of the rates described above
in clauses (a), (b) and (c), which is not assigned to and not part of the Trust
Estate.

            Fixed Retained Yield Rate: With respect to each Mortgage Loan, a per
annum rate equal to the greater of (a) zero and (b) the Mortgage Interest Rate
on such Mortgage Loan minus, the sum of (a) 5.500%, (b) the applicable Servicing
Fee Rate and (c) the Master Servicing Fee Rate.

            Full Unscheduled Principal Receipt: Any Unscheduled Principal
Receipt with respect to a Mortgage Loan (i) in the amount of the outstanding
principal balance of such Mortgage Loan and resulting in the full satisfaction
of such Mortgage Loan or (ii) representing Liquidation Proceeds other than
Partial Liquidation Proceeds.

            Holder: See "Certificateholder."

            Independent: When used with respect to any specified Person, such
Person who (i) is in fact independent of the Seller, the Master Servicer and any
Servicer, (ii) does not have any direct financial interest or any material
indirect financial interest in the Seller or the Master Servicer or any Servicer
or in an affiliate of either and (iii) is not connected with the Seller, the
Master Servicer or any Servicer as an officer, employee, promoter, underwriter,
trustee, partner, director or person performing similar functions.

            Individual Class A-1 Certificate: A Class A-1 Certificate which
evidences a $1,000 Original Principal Balance.

            Insurance Policy: Any insurance or performance bond relating to a
Mortgage Loan or the Mortgage Loans, including any hazard insurance, special
hazard insurance, flood insurance, primary mortgage insurance, mortgagor
bankruptcy bond or title insurance.

            Insurance Proceeds: Proceeds paid by any insurer pursuant to any
Insurance Policy covering a Mortgage Loan.

            Insured Expenses: Expenses covered by any Insurance Policy covering
a Mortgage Loan.

            Insured Payment: The sum of (i) as of any Distribution Date, any
Deficiency Amount and (ii) any Preference Amount.

            Interest Accrual Amount: As to any Distribution Date and any Class
of Class A Certificates (other than the Class A-14 and Class A-PO Certificates),
(i) the product of (a) 1/12th of the Class A Pass-Through Rate for such Class
and (b) the Principal Balance of such Class or, in the case of the Interest Only
Certificates, the Notional Amount, as of the Determination Date immediately
preceding such Distribution Date minus (ii) the sum of (A) the Class A Interest
Percentage of such Class of the interest portion of any Realized Losses on the
Mortgage Loans on or after the Subordination Depletion Date pursuant to Section
4.02(c) and (B) the Class A Interest Percentage of such Class of any
Non-Supported Interest Shortfall or Relief Act Shortfall allocated to the Class
A Certificates with respect to such Distribution Date. The Class A-14 and Class
A-PO Certificates have no Interest Accrual Amount.

            As to any Distribution Date and any Class of Class B Certificates,
an amount equal to (i) the product of 1/12th of the Class B Pass-Through Rate
and the Principal Balance of such Class as of the Determination Date preceding
such Distribution Date minus (ii) the Class B Interest Percentage of such Class
of the sum of any Non-Supported Interest Shortfall and any Relief Act Shortfall
allocated to the Class B Certificates with respect to such Distribution Date.

             Interest Only Certificates: The Class A-12 Certificates.

            LIBOR: As to any Distribution Date, the arithmetic mean of the
London Interbank offered rate quotations for one month U.S. dollar deposits, as
determined by the Trustee on the related Rate Determination Date in accordance
with Section 4.10.

            LIBOR Business Day: Any Business Day on which banks are open for
dealing in foreign currency and exchange in London, England, the City of New
York and Charlotte, North Carolina.

             LIBOR Certificates: Any of the Class A-3, Class A-5, Class A-11 and
Class A-12 Certificates.

            Liquidated Loan: A Mortgage Loan with respect to which the related
Mortgaged Property has been acquired, liquidated or foreclosed and with respect
to which the applicable Servicer determines that all Liquidation Proceeds which
it expects to recover have been recovered.

            Liquidated Loan Loss: With respect to any Distribution Date, the
aggregate of the amount of losses with respect to each Mortgage Loan which
became a Liquidated Loan during the Applicable Unscheduled Principal Receipt
Period with respect to Full Unscheduled Principal Receipts for such Distribution
Date, equal to the excess of (i) the unpaid principal balance of each such
Liquidated Loan, plus accrued interest thereon in accordance with the
amortization schedule at the time applicable thereto at the applicable Net
Mortgage Interest Rate from the Due Date as to which interest was last paid with
respect thereto through the last day of the month preceding the month in which
such Distribution Date occurs, over (ii) Net Liquidation Proceeds with respect
to such Liquidated Loan.

            Liquidation Expenses: Expenses incurred by a Servicer in connection
with the liquidation of any defaulted Mortgage Loan or property acquired in
respect thereof (including, without limitation, legal fees and expenses,
committee or referee fees, and, if applicable, brokerage commissions and
conveyance taxes), any unreimbursed advances (including Periodic Advances)
expended by such Servicer pursuant to its Servicing Agreement or the Master
Servicer or Trustee pursuant hereto respecting the related Mortgage Loan,
including any unreimbursed advances for real property taxes or for property
restoration or preservation of the related Mortgaged Property. Liquidation
Expenses shall not include any previously incurred expenses in respect of an REO
Mortgage Loan which have been netted against related REO Proceeds.

            Liquidation Proceeds: Amounts received by a Servicer (including
Insurance Proceeds) or PMI Advances made by a Servicer in connection with the
liquidation of defaulted Mortgage Loans or property acquired in respect thereof,
whether through foreclosure, sale or otherwise, including payments in connection
with such Mortgage Loans received from the Mortgagor, other than amounts
required to be paid to the Mortgagor pursuant to the terms of the applicable
Mortgage or to be applied otherwise pursuant to law.

            Liquidation Profits: As to any Distribution Date and any Mortgage
Loan that became a Liquidated Loan during the Applicable Unscheduled Principal
Receipt Period with respect to Full Unscheduled Principal Receipts for such
Distribution Date, the excess, if any, of (i) Net Liquidation Proceeds in
respect of such Liquidated Loan over (ii) the unpaid principal balance of such
Liquidated Loan plus accrued interest thereon in accordance with the
amortization schedule at the time applicable thereto at the applicable Net
Mortgage Interest Rate from the Due Date to which interest was last paid with
respect thereto through the last day of the month preceding the month in which
such Distribution Date occurs.

            Living Holder: Beneficial Owner of a Class A-1 Certificate other
than a Deceased Holder.

            Loan-to-Value Ratio: The ratio, expressed as a percentage, the
numerator of which is the principal balance of a particular Mortgage Loan at
origination and the denominator of which is the lesser of (x) the appraised
value of the related Mortgaged Property determined in the appraisal used by the
originator at the time of origination of such Mortgage Loan, and (y) if the
Mortgage is originated in connection with a sale of the Mortgaged Property, the
sale price for such Mortgaged Property.

            Lower-Tier Distribution Amount: As defined in Section 4.01(a)(ii).

            Lower-Tier REMIC: One of two separate REMICs comprising the Trust
Estate, the assets of which consist of the Mortgage Loans (other than Fixed
Retained Yield), such amounts as shall from time to time be held in the
Certificate Account (other than Fixed Retained Yield), the insurance policies,
if any, relating to a Mortgage Loan and property which secured a Mortgage Loan
and which has been acquired by foreclosure or deed in lieu of foreclosure.

            Master Servicer: Wells Fargo Bank, or its successor in interest.
Initially, the Master Servicer functions shall be performed by the Corporate
Trust Services division of Wells Fargo Bank.

            Master Servicing Fee: With respect to any Mortgage Loan and any
Distribution Date, the fee payable monthly to the Master Servicer pursuant to
Section 6.05 equal to a fixed percentage (expressed as a per annum rate) of the
unpaid principal balance of such Mortgage Loan.

            Master Servicing Fee Rate: As set forth in Section 11.25.

            Master Servicing Officer: Any officer of the Master Servicer
involved in, or responsible for, the administration and master servicing of the
Mortgage Loans.

             MBIA: MBIA Insurance Corporation, a New York-domiciled stock
insurance company, or any successor thereto.

            MBIA Contact Person: The officer designated by the Master Servicer
to provide information to MBIA pursuant to Section 4.08(g). The initial MBIA
Contact Person is appointed in Section 11.25.

            MBIA Default: The existence and continuance of any of the following:

            (a) MBIA fails to make a payment required under the Policy in
accordance with its terms;

             (b) MBIA (A) files any petition or commences any case or proceeding
under any provision or similar federal or state law relating to insolvency,
bankruptcy, rehabilitation, liquidation or reorganization, (B) makes a general
assignment for the benefit of its creditors, or (C) has an order for relief
entered against it under the United States Bankruptcy Code or any similar
federal or state law relating to insolvency, bankruptcy, rehabilitation,
liquidation or reorganization which is final and nonappealable; or

            (c) a court of competent jurisdiction, the New York Department of
Insurance or other competent regulatory authority enters a final and
nonappealable order, judgment or decree (1) appointing a custodian, trustee,
agent or receiver for MBIA or for all or any material portion of its property or
(2) authorizing the taking of possession by a custodian, trustee, agent or
receiver of MBIA (or the taking of possession of all or any material portion of
the property of MBIA).

            MERS: The Mortgage Electronic Registration Systems, Inc.

            MERS Mortgage Loan: Any MOM Mortgage Loan or any other Mortgage Loan
as to which MERS is (or is intended to be) the mortgagee of record and as to
which a MIN has been assigned.

            Mid-Month Receipt Period: With respect to each Distribution Date,
the one month period beginning on the Determination Date (or, in the case of the
first Distribution Date, from and including the Cut-Off-Date) occurring in the
calendar month preceding the month in which such Distribution Date occurs and
ending on the day preceding the Determination Date immediately preceding such
Distribution Date.

            MIN: A MERS Mortgage Identification Number assigned to a Mortgage
Loan registered under MERS.

             MOM: A Mortgage Loan where the related Mortgage names MERS as the
original mortgagee thereof, as to which a MIN has been assigned, and which
Mortgage has not been assigned to any other person.

            Month End Interest: As defined in each Servicing Agreement.

            Monthly Payment: As to any Mortgage Loan (including any REO Mortgage
Loan) and any Due Date, the payment of principal and interest due thereon in
accordance with the amortization schedule at the time applicable thereto (after
adjustment for any Curtailments and Deficient Valuations occurring prior to such
Due Date but before any adjustment to such amortization schedule, other than for
Deficient Valuations, by reason of any bankruptcy or similar proceeding or any
moratorium or similar waiver or grace period).

            Moody's: Moody's Investors Service, Inc. or its successor in
interest.

            Mortgage: The mortgage, deed of trust or other instrument creating a
first lien on Mortgaged Property securing a Mortgage Note together with any
Mortgage Loan Rider, if applicable.

            Mortgage Interest Rate: As to any Mortgage Loan, the per annum rate
at which interest accrues on the unpaid principal balance thereof as set forth
in the related Mortgage Note, which rate is as indicated on the Mortgage Loan
Schedule.

            Mortgage Loan Purchase Agreement: The mortgage loan purchase
agreement dated as of December 22, 2005 between Wells Fargo Bank, as seller, and
the Seller, as purchaser.

            Mortgage Loan Rider: The standard Fannie Mae/Freddie Mac riders to
the Mortgage Note and/or Mortgage riders required when the Mortgaged Property is
a condominium unit or a unit in a planned unit development.

            Mortgage Loan Schedule: The list of the Mortgage Loans transferred
to the Trustee on the Closing Date as part of the Trust Estate and attached
hereto as Exhibits F-1 and F-2, which list may be amended following the Closing
Date upon conveyance of a Substitute Mortgage Loan pursuant to Section 2.02,
2.03 or 2.06 and which list shall set forth at a minimum the following
information as of the close of business on the Cut-Off Date (or, with respect to
Substitute Mortgage Loans, as of the close of business on the day of
substitution) as to each Mortgage Loan:

             (i)    the Mortgage Loan identifying number;

            (ii)   the city, state and zip code of the Mortgaged Property;

           (iii)   the type of property;

            (iv)   the Mortgage Interest Rate;

             (v)   the Net Mortgage Interest Rate;

            (vi)   the Monthly Payment;

           (vii)   the original number of months to maturity;

          (viii)   the scheduled maturity date;

            (ix)   the Cut-Off Date Principal Balance;

             (x)   the Loan-to-Value Ratio at origination;

            (xi)   whether such Mortgage Loan is a Subsidy Loan;

           (xii)   whether such Mortgage Loan is covered by primary mortgage
                  insurance;

          (xiii)   the applicable Servicing Fee Rate;

           (xiv)   the Master Servicing Fee Rate;

            (xv)   Fixed Retained Yield Rate, if applicable; and

           (xvi)   for each Other Servicer Mortgage Loan, the name of the
                  Servicer with respect thereto.

            Such schedule may consist of multiple reports that collectively set
forth all of the information required.

            Mortgage Loans: Each of the mortgage loans transferred and assigned
to the Trustee on the Closing Date pursuant to Section 2.01(a) and any mortgage
loans substituted therefor pursuant to Section 2.02, 2.03 or 2.06, in each case
as from time to time are included in the Trust Estate as identified in the
Mortgage Loan Schedule.

            Mortgage Note: The note or other evidence of indebtedness evidencing
the indebtedness of a Mortgagor under a Mortgage Loan together with any related
Mortgage Loan Riders, if applicable.

            Mortgaged Property: The property subject to a Mortgage, which may
include Co-op Shares or residential long-term leases.

             Mortgagor: The obligor on a Mortgage Note.

            NAS I Priority Amount: For any Distribution Date, means the product
of (1) the NAS I Priority Percentage, (2) the Shift Percentage and (3) the sum
of the Scheduled Principal Amount and the Unscheduled Principal Amount.

            NAS I Priority Percentage: The sum of the Principal Balances of the
Class A-4 and Class A-15 Certificates divided by the Aggregate Non-PO Principal
Balance.

            NAS II Priority Amount: For any Distribution Date, means the product
of (1) the NAS II Priority Percentage, (2) the Shift Percentage and (3) the
amount available to be distributed to the Class A Non-PO Certificates pursuant
to II. priority second (b)(ii) of Section 4.01(b).

            NAS II Priority Percentage: The lesser of (i) 99.99% or (ii) (x) the
sum of (i) the Principal Balances of the Class A-8 and Class A-19 Certificates
and (ii) $8,062,500 divided by (y) the sum of the Principal Balances of the
Class A-1, Class A-8, Class A-14, Class A-16, Class A-17, Class A-18 and Class
A-19 Certificates.

            Net Liquidation Proceeds: As to any defaulted Mortgage Loan,
Liquidation Proceeds net of Liquidation Expenses.

            Net Mortgage Interest Rate: With respect to each Mortgage Loan, a
rate equal to (i) the Mortgage Interest Rate on such Mortgage Loan minus (ii)
the sum of (a) the applicable Servicing Fee Rate, as set forth in Section 11.24
with respect to such Mortgage Loan, (b) the Master Servicing Fee Rate, as set
forth in Section 11.25 with respect to such Mortgage Loan and (c) the Fixed
Retained Yield Rate, if any, with respect to such Mortgage Loan. Any regular
monthly computation of interest at such rate shall be based upon annual interest
at such rate on the applicable amount divided by twelve.

            Net REO Proceeds: As to any REO Mortgage Loan, REO Proceeds net of
any related expenses of the Servicer.

            Non-permitted Foreign Holder: As defined in Section 5.02(d).

            Non-PO Fraction: With respect to any Mortgage Loan, the lesser of
(i) 1.00 and (ii) the quotient obtained by dividing the Net Mortgage Interest
Rate for such Mortgage Loan by 5.500%.

            Non-PO Recovery: As to any Distribution Date, the amount of all
Recoveries received during the Applicable Unscheduled Principal Receipt Periods
for such Distribution Date less the Class A-PO Recovery for such Distribution
Date.

            Nonrecoverable Advance: Any portion of a Periodic Advance previously
made or proposed to be made in respect of a Mortgage Loan which has not been
previously reimbursed to the Servicer, the Master Servicer or the Trustee, as
the case may be, and which the Servicer, the Master Servicer or the Trustee
determines will not, or in the case of a proposed Periodic Advance would not, be
ultimately recoverable from Liquidation Proceeds or other recoveries in respect
of the related Mortgage Loan. The determination by the Servicer, the Master
Servicer or the Trustee (i) that it has made a Nonrecoverable Advance or (ii)
that any proposed Periodic Advance, if made, would constitute a Nonrecoverable
Advance, shall be evidenced by an Officer's Certificate of the Servicer
delivered to the Master Servicer for redelivery to the Trustee or, in the case
of a Master Servicer determination, an Officer's Certificate of the Master
Servicer delivered to the Trustee, in each case detailing the reasons for such
determination.

            Non-Supported Interest Shortfall: With respect to any Distribution
Date, the sum of (i) the excess, if any, of the aggregate Prepayment Interest
Shortfall on the Mortgage Loans over the aggregate Compensating Interest with
respect to such Distribution Date and (ii) Curtailment Interest Shortfalls with
respect to such Distribution Date. With respect to each Distribution Date
occurring on or after the Subordination Depletion Date, the Non-Supported
Interest Shortfall determined pursuant to the preceding sentence will be
increased by the amount of any Subordination Depletion Date Interest Shortfall
for such Distribution Date. Any Non-Supported Interest Shortfall will be
allocated to (a) the Class A Certificates (other that the Class A-PO
Certificates) according to the percentage obtained by dividing the Class A
Non-PO Principal Balance by the Aggregate Non-PO Principal Balance and (b) the
Class B Certificates according to the percentage obtained by dividing the Class
B Principal Balance by the Aggregate Non-PO Principal Balance.

            Non-U.S. Person: As defined in Section 4.01(g).

            Notice of Nonpayment: The notice to be delivered by the Trustee to
MBIA with respect to any date as to which a claim for an Insured Payment shall
be made, which shall be in the form attached to the Policy.

            Notional Amount: The Class A-12 Notional Amount.

             NYCEMA: A New York Consolidation, Extension and Modification
Agreement.

            Officers' Certificate: With respect to any Person, a certificate
signed by the Chairman of the Board, the President or a Vice President, and by
the Treasurer, the Secretary or one of the Assistant Treasurers or Assistant
Secretaries of such Person (or, in the case of a Person which is not a
corporation, signed by the person or persons having like responsibilities), and
delivered to the Trustee.

            Opinion of Counsel: A written opinion of counsel, who may be outside
or salaried counsel for the Seller, a Servicer or the Master Servicer, or any
affiliate of the Seller, a Servicer or the Master Servicer, acceptable to the
Trustee if such opinion is to be delivered to the Trustee; provided, however,
that with respect to REMIC matters, matters relating to the determination of
Eligible Accounts or matters relating to transfers of Certificates, such counsel
shall be Independent.

            Optimal Adjustment Event: With respect to any Class of Class B
Certificates and any Distribution Date, an Optimal Adjustment Event will occur
with respect to such Class if: (i) the Principal Balance of such Class on the
Determination Date succeeding such Distribution Date would have been reduced to
zero (regardless of whether such Principal Balance was reduced to zero as a
result of principal distribution or the allocation of Realized Losses) and (ii)
(a) the Principal Balance of any Class of Class A Non-PO Certificates would be
subject to further reduction as a result of the third sentence of the definition
of Principal Balance or (b) the Principal Balance of a Class of Class B
Certificates with a lower numerical designation would be reduced with respect to
such Distribution Date as a result of the application of the proviso in the
definition of Class B-1 Principal Balance, Class B-2 Principal Balance, Class
B-3 Principal Balance, Class B-4 Principal Balance, Class B-5 Principal Balance
or Class B-6 Principal Balance.

            Original Aggregate Non-PO Principal Balance: The Aggregate Non-PO
Principal Balance as of the Cut-Off Date, as set forth in Section 11.06.

            Original Class A Percentage: The Class A Percentage as of the
Cut-Off Date as set forth in Section 11.03.

            Original Class A-12 Notional Amount: The Original Class A-12
Notional Amount as set forth in Section 11.04(a).

            Original Class B Principal Balance: The sum of the Original Class
B-1 Principal Balance, the Original Class B-2 Principal Balance, the Original
Class B-3 Principal Balance, the Original Class B-4 Principal Balance, the
Original Class B-5 Principal Balance and the Original Class B-6 Principal
Balance, as set forth in Section 11.07.

            Original Class B-1 Fractional Interest: As to the first Distribution
Date, the percentage obtained by dividing the sum of the Original Class B-2
Principal Balance, the Original Class B-3 Principal Balance, the Original Class
B-4 Principal Balance, the Original Class B-5 Principal Balance and the Original
Class B-6 Principal Balance by the Original Aggregate Non-PO Principal Balance.
The Original Class B-1 Fractional Interest is specified in Section 11.09.

            Original Class B-2 Fractional Interest: As to the first Distribution
Date, the percentage obtained by dividing the sum of the Original Class B-3
Principal Balance, the Original Class B-4 Principal Balance, the Original Class
B-5 Principal Balance and the Original Class B-6 Principal Balance by the
Original Aggregate Non-PO Principal Balance. The Original Class B-2 Fractional
Interest is specified in Section 11.10.

            Original Class B-3 Fractional Interest: As to the first Distribution
Date, the percentage obtained by dividing the sum of the Original Class B-4
Principal Balance, the Original Class B-5 Principal Balance and the Original
Class B-6 Principal Balance by the Original Aggregate Non-PO Principal Balance.
The Original Class B-3 Fractional Interest is specified in Section 11.11.

            Original Class B-4 Fractional Interest: As to the first Distribution
Date, the percentage obtained by dividing the sum of the Original Class B-5
Principal Balance and the Original Class B-6 Principal Balance by the Original
Aggregate Non-PO Principal Balance. The Original Class B-4 Fractional Interest
is specified in Section 11.12.

            Original Class B-5 Fractional Interest: As to the first Distribution
Date, the percentage obtained by dividing the Original Class B-6 Principal
Balance by the Original Aggregate Non-PO Principal Balance. The Original Class
B-5 Fractional Interest is specified in Section 11.13.

            Original Class B-1 Percentage: The Class B-1 Percentage as of the
Cut-Off Date, as set forth in Section 11.14.

            Original Class B-2 Percentage: The Class B-2 Percentage as of the
Cut-Off Date, as set forth in Section 11.15.

            Original Class B-3 Percentage: The Class B-3 Percentage as of the
Cut-Off Date, as set forth in Section 11.16.

            Original Class B-4 Percentage: The Class B-4 Percentage as of the
Cut-Off Date, as set forth in Section 11.17.

            Original Class B-5 Percentage: The Class B-5 Percentage as of the
Cut-Off Date, as set forth in Section 11.18.

            Original Class B-6 Percentage: The Class B-6 Percentage as of the
Cut-Off Date, as set forth in Section 11.19.

            Original Class B-1 Principal Balance: The Class B-1 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

            Original Class B-2 Principal Balance: The Class B-2 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

            Original Class B-3 Principal Balance: The Class B-3 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

            Original Class B-4 Principal Balance: The Class B-4 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

            Original Class B-5 Principal Balance: The Class B-5 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

             Original Class B-6 Principal Balance: The Class B-6 Principal
Balance as of the Cut-Off Date, as set forth in Section 11.08.

            Original Notional Amount: The Original Class A-12 Notional Amount
set forth in Section 11.04(a).

            Original Principal Balance: Any of the Original Principal Balances
of the Classes of Class A Certificates as set forth in Section 11.04; the
Original Class B-1 Principal Balance, Original Class B-2 Principal Balance,
Original Class B-3 Principal Balance, Original Class B-4 Principal Balance,
Original Class B-5 Principal Balance or Original Class B-6 Principal Balance as
set forth in Section 11.08.

            Other Servicer: Any of the Servicers other than Wells Fargo Bank.

            Other Servicer Mortgage Loan: Any of the Mortgage Loans, if any,
identified in Exhibit F-2 hereto, as such Exhibit may be amended from time to
time in connection with a substitution pursuant to Section 2.02, 2.03 or 2.06,
which Mortgage Loan is serviced under an Other Servicing Agreement.

            Other Servicing Agreements: The Servicing Agreements other than the
Wells Fargo Bank Servicing Agreement.

            Outstanding Mortgage Loan: As to any Due Date, a Mortgage Loan
(including an REO Mortgage Loan) which was not the subject of a Full Unscheduled
Principal Receipt prior to such Due Date and which was not repurchased by the
Seller prior to such Due Date pursuant to Section 2.02, 2.03 or 3.08.

            Owner Mortgage Loan File: A file maintained by the Custodian for
each Mortgage Loan that contains the documents specified in Section 2.01(a) and
any additional documents required to be added to the Owner Mortgage Loan File
pursuant to this Agreement.

            PAC Group: The Class A-9, Class A-10 and Class A-13 Certificates.

            PAC Principal Amount: As defined in Section 4.01(b).

            Partial Liquidation Proceeds: Liquidation Proceeds received by a
Servicer prior to the Unscheduled Principal Receipt Period in which the related
Mortgage Loan became a Liquidated Loan.

            Partial Unscheduled Principal Receipt: An Unscheduled Principal
Receipt which is not a Full Unscheduled Principal Receipt.

            Paying Agent: The Person authorized on behalf of the Trustee to make
distributions to Certificateholders with respect to the Certificates and to
forward to Certificateholders the periodic and annual statements required by
Section 4.04. The Paying Agent may be the Trustee. The initial Paying Agent is
appointed in Section 4.03(b).

             Payment Account: The account maintained pursuant to Section 4.03(a).

            Percentage Interest: With respect to a Class A Certificate of a
Class (other than the Interest Only and Class A-1 Certificates), the undivided
percentage interest obtained by dividing the original principal balance of such
Certificate by the Original Principal Balance of such Class of Class A
Certificates. With respect to an Interest Only Certificate, the undivided
percentage interest obtained by dividing the original notional amount evidenced
by such Interest Only Certificate by the Original Notional Amount. With respect
to a Class A-1 Certificate, the undivided percentage interest obtained by
dividing the current principal balance of such Certificate by the Principal
Balance of such Class of Class A Certificates. With respect to a Class B
Certificate of a Class, the undivided percentage interest obtained by dividing
the original principal balance of such Certificate by the Original Principal
Balance of such Class of Class B Certificates.

            Periodic Advance: The aggregate of the advances required to be made
by a Servicer on any Distribution Date pursuant to its Servicing Agreement or by
the Master Servicer or the Trustee hereunder, the amount of any such advances
being equal to the total of all Monthly Payments (adjusted, in each case (i) in
respect of interest, to the applicable Mortgage Interest Rate less the
applicable Servicing Fee in the case of Periodic Advances made by a Servicer and
to the applicable Net Mortgage Interest Rate in the case of Periodic Advances
made by the Master Servicer or Trustee and (ii) by the amount of any related
Debt Service Reductions or reductions in the amount of interest collectable from
the Mortgagor pursuant to the Servicemembers Civil Relief Act, as it may be
amended from time to time, or similar legislation or regulations then in effect)
on the Mortgage Loans, that (x) were delinquent as of the close of business on
the related Determination Date, (y) were not the subject of a previous Periodic
Advance by such Servicer or of a Periodic Advance by the Master Servicer or the
Trustee, as the case may be and (z) have not been determined by the Master
Servicer, such Servicer or Trustee to be Nonrecoverable Advances.

            Person: Any individual, corporation, partnership, joint venture,
association, joint-stock company, trust, unincorporated organization or
government or any agency or political subdivision thereof.

            Plan: As defined in Section 5.02(c).

            PMI Advance: As defined in the related Servicing Agreement, if
applicable.

            PO Fraction: With respect to any Discount Mortgage Loan, the
difference between 1.0 and the Non-PO Fraction for such Mortgage Loan; with
respect to any other Mortgage Loan, zero.

            Policy: The irrevocable MBIA Insurance Policy No. 47458, including
any endorsements thereto, issued by MBIA with respect to the Class A-1
Certificates, in the form attached hereto as Exhibit Q.

            Policy Payment Account: The account maintained pursuant to Section
4.08(b).

            Pool Balance (Non-PO Portion): As of any Distribution Date, the sum
of the amounts for each Mortgage Loan that is an Outstanding Mortgage Loan of
the product of (i) the Non-PO Fraction for such Mortgage Loan and (ii) the
Scheduled Principal Balance of such Mortgage Loan.

            Pool Balance (PO Portion): As of any Distribution Date, the sum of
the amounts for each Mortgage Loan that is an Outstanding Mortgage Loan of the
product of (i) the PO Fraction for such Mortgage Loan and (ii) the Scheduled
Principal Balance of such Mortgage Loan.

            Pool Distribution Amount: As of any Distribution Date, the funds
eligible for distribution to the Class A Certificates, MBIA and Class B
Certificates on such Distribution Date, which shall be the sum of (i) all
previously undistributed payments or other receipts on account of principal and
interest on or in respect of the Mortgage Loans (including, without limitation,
the proceeds of any repurchase of a Mortgage Loan by the Seller and any
Substitution Principal Amount) received by the Master Servicer with respect to
the applicable Remittance Date in the month of such Distribution Date and any
Unscheduled Principal Receipts received by the Master Servicer on or prior to
the Business Day preceding such Distribution Date, (ii) all Periodic Advances
made by a Servicer pursuant to the related Servicing Agreement or Periodic
Advances made by the Master Servicer or the Trustee pursuant to Section 3.03,
(iii) any remaining Reimbursement Amount as provided in Section 4.01(a) and (iv)
all other amounts (including any Insurance Proceeds and Compensating Interest)
required to be placed in the Certificate Account by the Servicer on or before
the applicable Remittance Date or by the Master Servicer or the Trustee on or
prior to the Distribution Date, but excluding the following:

            (a) amounts received as late payments of principal or interest and
      respecting which the Master Servicer or the Trustee has made one or more
      unreimbursed Periodic Advances;

            (b) the portion of Liquidation Proceeds used to reimburse any
      unreimbursed Periodic Advances by the Master Servicer or the Trustee;

            (c) that portion of each payment of interest on a particular
      Mortgage Loan which represents (i) the Fixed Retained Yield, if any, (ii)
      the applicable Servicing Fee and (iii) the Master Servicing Fee;

            (d) all amounts representing scheduled payments of principal and
       interest due after the Due Date occurring in the month in which such
      Distribution Date occurs;

            (e) all Unscheduled Principal Receipts received by the Servicers
      after the Applicable Unscheduled Principal Receipt Period relating to the
      Distribution Date for the applicable type of Unscheduled Principal
      Receipt, and all related payments of interest on such amounts;

            (f) all repurchase proceeds with respect to Mortgage Loans
      repurchased by the Seller pursuant to Section 2.02, 2.03 or 3.08 on or
      following the Determination Date in the month in which such Distribution
      Date occurs and the difference between the unpaid principal balance of a
      Mortgage Loan substituted for a Mortgage Loan pursuant to Section 2.02,
      2.03 or 2.06 on or following the Determination Date in the month in which
      such Distribution Date occurs and the unpaid principal balance of such
      Mortgage Loan;

            (g) that portion of Liquidation Proceeds and REO Proceeds which
      represents any unpaid Servicing Fee or Master Servicing Fee;

            (h) all income from Eligible Investments that is held in the
      Certificate Account for the account of the Master Servicer;

            (i) Liquidation Profits;

            (j) Month End Interest;

            (k) all amounts reimbursable to a Servicer for PMI Advances; and

            (l) all other amounts permitted to be withdrawn from the Certificate
      Account, to the extent not covered by clauses (a) through (k) above, or
      not required to be deposited in the Certificate Account under this
      Agreement.

            Pool Scheduled Principal Balance: As to any Distribution Date, the
aggregate Scheduled Principal Balance of all Mortgage Loans that were
Outstanding Mortgage Loans on the Due Date in the month preceding the month of
such Distribution Date.

            Premium Mortgage Loan: A Mortgage Loan with a Net Mortgage Interest
Rate equal to or greater than 5.500%.

            Preference Amount: Any amount previously distributed to a Class A-1
Certificateholder on the Class A-1 Certificates that is recoverable and sought
to be recovered as a voidable preference by a trustee in bankruptcy pursuant to
the United States Bankruptcy Code (11 U.S.C.), as amended from time to time, in
accordance with a final nonappealable order of a court having competent
jurisdiction.

            Premium Payment: As to any Distribution Date, the product of (a)
1/12th of 0.120% and (b) the Principal Balance of the Class A-1 Certificates as
of the Determination Date immediately preceding such Distribution Date.

            Premium Shortfall Amount: As to any Distribution Date, any amount by
which the Premium Payment with respect to such Distribution Date exceeds the
amount distributed to MBIA on such Distribution Date pursuant to Paragraph first
of Section 4.01(a).

            Premium Unpaid Shortfall: As to any Distribution Date, the amount,
if any, by which the aggregate of the Premium Shortfall Amounts for prior
Distribution Dates is in excess of the amounts distributed to MBIA on prior
Distribution Dates pursuant to Paragraph second of Section 4.01(a).

            Prepayment In Full: With respect to any Mortgage Loan, a Mortgagor
payment consisting of a Principal Prepayment in the amount of the outstanding
principal balance of such loan and resulting in the full satisfaction of such
obligation.

            Prepayment Interest Shortfall: On any Distribution Date, the amount
of interest, if any, that would have accrued on any Mortgage Loan which was the
subject of a Prepayment in Full at the Net Mortgage Interest Rate for such
Mortgage Loan from the date of its Prepayment in Full (but in the case of a
Prepayment in Full where the Applicable Unscheduled Principal Receipt Period is
the Mid-Month Receipt Period, only if the date of the Prepayment in Full is on
or after the Determination Date in the month prior to the month of such
Distribution Date and prior to the first day of the month of such Distribution
Date) through the last day of the month prior to the month of such Distribution
Date.

            Principal Adjustment: In the event that the Class B-1 Optimal
Principal Amount, Class B-2 Optimal Principal Amount, Class B-3 Optimal
Principal Amount, Class B-4 Optimal Principal Amount, Class B-5 Optimal
Principal Amount or Class B-6 Optimal Principal Amount is calculated in
accordance with the proviso in such definition with respect to any Distribution
Date, the Principal Adjustment for such Class of Class B Certificates shall
equal the difference between (i) the amount that would have been distributed to
such Class as principal in accordance with Section 4.01(a) for such Distribution
Date, calculated without regard to such proviso and assuming there are no
Principal Adjustments for such Distribution Date and (ii) the Adjusted Principal
Balance for such Class.

            Principal Balance: As of the first Determination Date and as to any
Class of Class A Certificates (other than the Interest Only Certificates), the
Original Principal Balance of such Class. As of any subsequent Determination
Date prior to the Subordination Depletion Date and as to any Class of Class A
Certificates (other than the Interest Only Certificates and the Class A-PO
Certificates), the Original Principal Balance of such Class (increased in the
case of the Accrual Certificates by the Accrual Distribution Amounts with
respect to prior Distribution Dates) less the sum of all amounts previously
distributed in respect of such Class on prior Distribution Dates (i) pursuant to
Paragraph third clause (1) of Section 4.01(a), (ii) as a result of a Principal
Adjustment and (iii), if applicable, from the Accrual Distribution Amounts for
such prior Distribution Dates. After the Subordination Depletion Date, each such
Principal Balance of a Class of Class A Certificates (other than the Class A-PO
Certificates) will also be reduced (if clause (a) is greater than clause (b)) or
increased (if clause (a) is less than clause (b)) on each Determination Date by
an amount equal to the product of the Class A Loss Percentage of such Class and
the difference, if any, between (a) the Class A Non-PO Principal Balance as of
such Determination Date without regard to this sentence and (b) the Adjusted
Pool Amount (Non-PO Portion) for the preceding Distribution Date; provided,
however, that the amount of any such reduction for the Class A-2 Certificates
will be decreased by the Class A-13 Loss Allocation Amount, the amount of any
such reduction for the Class A-4 Certificates will be decreased by the Class
A-15 Loss Allocation Amount and the amount of any such reduction for the Class
A-8 Certificates will be decreased by the Class A-19 Loss Allocation Amount.
After the Subordination Depletion Date, the Principal Balance for the Class A-2
Certificates will additionally be reduced by the Class A-2 Loss Allocation
Amount, the Principal Balance for the Class A-4 Certificates will additionally
be reduced by the Class A-4 Loss Allocation Amount and the Principal Balance for
the Class A-8 Certificates will additionally be reduced by the Class A-8 Loss
Allocation Amount. In addition, any increase allocated to the Class A-2
Certificates pursuant to the third sentence above will instead increase the
Principal Balance of the Class A-13 Certificates, any increase allocated to the
Class A-4 Certificates pursuant to the third sentence above will instead
increase the Principal Balance of the Class A-15 Certificates and any increase
allocated to the Class A-8 Certificates pursuant to the third sentence above
will instead increase the Principal Balance of the Class A-19 Certificates.
Notwithstanding the foregoing, on any Distribution Date in which the Class A-2
Loss Amount exceeds the Principal Balance of the Class A-13 Certificates prior
to any reduction for the Class A-13 Loss Allocation Amount, such excess will be
distributed in reduction of the Principal Balance of the Class A-2 Certificates.
Notwithstanding the foregoing, on any Distribution Date in which the Class A-4
Loss Amount exceeds the Principal Balance of the Class A-15 Certificates prior
to any reduction for the Class A-15 Loss Allocation Amount, such excess will be
distributed in reduction of the Principal Balance of the Class A-4 Certificates.
Notwithstanding the foregoing, on any Distribution Date in which the Class A-8
Loss Amount exceeds the Principal Balance of the Class A-19 Certificates prior
to any reduction for the Class A-19 Loss Allocation Amount, such excess will be
distributed in reduction of the Principal Balance of the Class A-8 Certificates.

            The Class A-12 Certificates are Interest Only Certificates and have
no Principal Balance.

            As of any subsequent Determination Date and as to the Class A PO
Certificates, the Original Principal Balance of such Class less the sum of all
amounts previously distributed in respect of the Class A PO Certificates on
prior Distribution Dates pursuant to Paragraph third clause (2) of Section
4.01(a). The Principal Balance of the Class A-PO Certificates will also be
reduced (if clause (x) is greater than clause (y)) or increased (if clause (x)
is less than clause (y)) on each Determination Date by the difference, if any,
between (x) the Principal Balance of the Class A-PO Certificates as of such
Determination Date without regard to this sentence and (y) the Adjusted Pool
Amount (PO Portion) for the preceding Distribution Date.

            As to the Class B Certificates, the Class B-1 Principal Balance,
Class B-2 Principal Balance, Class B-3 Principal Balance, Class B-4 Principal
Balance, Class B-5 Principal Balance and Class B-6 Principal Balance,
respectively.

            Notwithstanding the foregoing, no Principal Balance of a Class will
be increased on any Determination Date such that the Principal Balance of such
Class exceeds its Original Principal Balance (plus any Accrual Distribution
Amounts previously added to the Principal Balance of the Accrual Certificates)
less all amounts previously distributed in respect of such Class on prior
Distribution Dates pursuant to Paragraph third clause (1) of Section 4.01(a),
Paragraph third clause (2) of Section 4.01(a), or Paragraphs seventh, tenth,
thirteenth, sixteenth, nineteenth or twenty-second of Section 4.01(a).

            Principal Prepayment: Any Mortgagor payment on a Mortgage Loan which
is received in advance of its Due Date and is not accompanied by an amount
representing scheduled interest for any period subsequent to the date of
prepayment.

            Prior Month Receipt Period: With respect to each Distribution Date,
the calendar month preceding the month in which such Distribution Date occurs.

            Prohibited Transaction Tax: Any tax imposed under Section 860F of
the Code.

            Prospectus: The prospectus dated November 23, 2005 as supplemented
by the prospectus supplement dated December 19, 2005, relating to the Class A,
Class B-1, Class B-2 and Class B-3 Certificates.

            Prudent Servicing Practices: The standard of care set forth in each
Servicing Agreement.

            Rate Determination Date: As to any Distribution Date and any Class
of LIBOR Certificates, the second LIBOR Business Day preceding the 25th day of
the month preceding the month in which such Distribution Date occurs.

            Rating Agency: Any nationally recognized statistical credit rating
agency, or its successor, that rated one or more Classes of the Certificates at
the request of the Seller at the time of the initial issuance of the
Certificates. The Rating Agencies for the Class A Certificates are Fitch and
Moody's. The Rating Agency for the Class B-1, Class B-2, Class B-3, Class B-4
and Class B-5 Certificates is Fitch. If any such agency or a successor is no
longer in existence, "Rating Agency" shall be such statistical credit rating
agency, or other comparable Person, designated by the Seller, notice of which
designation shall be given to the Trustee and the Master Servicer. References
herein to the highest short-term rating category of a Rating Agency shall mean
F-1+ in the case of Fitch, P-1 in the case of Moody's, and in the case of any
other Rating Agency shall mean its equivalent of such ratings. References herein
to the highest long-term rating categories of a Rating Agency shall mean AAA in
the case of Fitch and Aaa in the case of Moody's, and in the case of any other
Rating Agency shall mean its equivalent of such ratings without any plus or
minus.

            Realized Losses: With respect to any Distribution Date, (i)
Liquidated Loan Losses incurred on Liquidated Loans for which the Liquidation
Proceeds were received during the Applicable Unscheduled Principal Receipt
Period with respect to Full Unscheduled Principal Receipts with respect to such
Distribution Date and (ii) Bankruptcy Losses incurred during the period
corresponding to the Applicable Unscheduled Principal Receipt Period with
respect to Full Unscheduled Principal Receipts for such Distribution Date.

            Record Date: For (i) the Class A-3, Class A-5, Class A-11 and Class
A-12 Certificates, the Business Day preceding the related Distribution Date and
(ii) all other Certificates, the last Business Day of the month preceding the
month of the related Distribution Date.

            Recovery: Any amount received on a Mortgage Loan subsequent to such
Mortgage Loan being determined to be a Liquidated Loan.

            Reference Banks: Initially, the Reference Banks shall be Deutsche
Bank International, Bank of America, N.A., Citibank, N.A., and The Fuji Bank,
Limited. If any of these banks are not available, the Trustee shall select from
one of the following banks a substitute Reference Bank: Credit Suisse First
Boston Corporation, Westdeutsche Landesbank Girozentrale, The J.P. Morgan Chase
Bank or National Westminster Bank Plc. If any of these banks are not available,
the Trustee shall in its discretion select another Reference Bank.

            Reimbursement Amount: As defined in Section 2.03(c).

            Relief Act Shortfall: Any interest shortfalls arising as a result of
the reduction in the amount of monthly interest payments on any Mortgage Loans
as a result of the application of the Servicemembers Civil Relief Act, as it may
be amended from time to time, or comparable state legislation. Any Relief Act
Shortfall will be allocated to (a) the Class A Certificates (other than the
Class A-PO Certificates) according to the percentage obtained by dividing the
Class A Non-PO Principal Balance by the Aggregate Non-PO Principal Balance and
(b) the Class B Certificates according to the percentage obtained by dividing
the Class B Principal Balance by the Aggregate Non-PO Principal Balance.

            REMIC: A "real estate mortgage investment conduit" as defined in
Code Section 860D. The Reserve Fund, the Policy and the Policy Payment Account
are not assets of either REMIC.

            REMIC Provisions: Provisions of the federal income tax law relating
to REMICs, which appear at Sections 860A through 860G of Part IV of Subchapter M
of Chapter 1 of Subtitle A of the Code, and related provisions, and U.S.
Department of the Treasury temporary, proposed or final regulations promulgated
thereunder, as the foregoing are in effect (or with respect to proposed
regulations, are proposed to be in effect) from time to time.

            Remittance Date: As defined in each of the Servicing Agreements.

             REO Mortgage Loan: Any Mortgage Loan which is not a Liquidated Loan
and as to which the indebtedness evidenced by the related Mortgage Note is
discharged and the related Mortgaged Property is held as part of the Trust
Estate.

            REO Proceeds: Proceeds received in respect of any REO Mortgage Loan
(including, without limitation, proceeds from the rental of the related
Mortgaged Property).

            Request for Release: A request for release (which may be in
electronic form) in substantially the form attached as Exhibit G hereto.

            Reserve Fund: The separate non-interest bearing trust account
established with the Trustee and maintained by the Trustee pursuant to Section
4.06 for the benefit of the Class A-1 Certificateholders. The Reserve Fund shall
be an Eligible Account.

            Reserve Withdrawal: With respect to any Distribution Date, the
lesser of (a) the amount on deposit in the Reserve Fund and (b) the sum of any
Non-Supported Interest Shortfall and any Relief Act Shortfall allocated to the
Class A-1 Certificates with respect to such Distribution Date.

            Responsible Officer: When used with respect to the Trustee, the
Chairman or Vice-Chairman of the Board of Directors or Trustees, the Chairman or
Vice-Chairman of the Executive or Standing Committee of the Board of Directors
or Trustees, the President, the Chairman of the Committee on Trust Matters, any
Vice President, the Secretary, any Assistant Secretary, the Treasurer, any
Assistant Treasurer, the Cashier, any Assistant Cashier, any Trust Officer or
Assistant Trust Officer, the Controller and any Assistant Controller or any
other officer of the Trustee customarily performing functions similar to those
performed by any of the above-designated officers and also, with respect to a
particular matter, any other officer to whom such matter is referred because of
such officer's knowledge of and familiarity with the particular subject.

            Retained Mortgage Loan File: A file maintained by Wells Fargo Bank
prior to any Document Transfer Event for each Mortgage Loan that contains the
documents specified in Section 2.01(b) and any additional documents required to
be added to the Retained Mortgage Loan File pursuant to this Agreement.

            Rounding Account: The special account established with the Trustee
and maintained by the Trustee pursuant to Section 4.07(e). The Rounding Account
shall be an Eligible Account.

            Rounding Amount: With respect to any Distribution Date, the amount,
if any, required to be withdrawn from the Rounding Account pursuant to Section
4.07(e).

            Rule 144A: Rule 144A promulgated under the Securities Act of 1933,
as amended.

            Scheduled Principal Amount: The sum for each outstanding Mortgage
Loan (including each defaulted Mortgage Loan with respect to which the related
Mortgaged Property has been acquired by the Trust Estate) of the product of (A)
the Non-PO Fraction for such Mortgage Loan and (B) the sum of the amounts
described in clauses Iy(i) and Iy(iv) of the definition of Class A Non-PO
Optimal Principal Amount, but without such amount being multiplied by the
Class A Percentage.

            Scheduled Principal Balance: As to any Mortgage Loan and
Distribution Date, the principal balance of such Mortgage Loan as of the Due
Date in the month preceding the month of such Distribution Date as specified in
the amortization schedule at the time relating thereto (before any adjustment to
such amortization schedule by reason of any bankruptcy (other than Deficient
Valuations) or similar proceeding or any moratorium or similar waiver or grace
period) after giving effect to (A) Unscheduled Principal Receipts received or
applied by the applicable Servicer during the related Unscheduled Principal
Receipt Period for each applicable type of Unscheduled Principal Receipt related
to the Distribution Date occurring in the month preceding such Distribution
Date, (B) Deficient Valuations incurred prior to such Due Date and (C) the
payment of principal due on such Due Date and irrespective of any delinquency in
payment by the related Mortgagor. Accordingly, the Scheduled Principal Balance
of a Mortgage Loan which becomes a Liquidated Loan at any time through the last
day of such related Unscheduled Principal Receipt Period shall be zero.

            Seller: Wells Fargo Asset Securities Corporation, or its successor
in interest.

            Servicer Mortgage Loan File: As defined in each of the Servicing
Agreements.

            Servicers: Wells Fargo Bank, as a Servicer under the related
Servicing Agreement. Initially the servicing functions performed by Wells Fargo
Bank shall be performed by the Wells Fargo Home Mortgage division of Wells Fargo
Bank.

            Servicing Agreements: Each of the Servicing Agreements executed with
respect to a portion of the Mortgage Loans by one of the Servicers, which
agreements are attached hereto, collectively, as Exhibit L.

            Servicing Fee: With respect to any Servicer, as defined in its
Servicing Agreement.

            Servicing Fee Rate: With respect to a Mortgage Loan, as set forth in
Section 11.24.

            Servicing Officer: Any officer of a Servicer involved in, or
responsible for, the administration and servicing of the Mortgage Loans.

            Shift Percentage: As to any Distribution Date, the percentage
indicated below:

                                                                     Prepayment
                                                                       Shift
  Distribution Date Occurring In                                      Percentage
  ------------------------------                                      ----------

  January 2006 through December 2010............................          0%
  January 2011 through December 2011.............................        30%
  January 2012 through December 2012.............................        40%
  January 2013 through December 2013.............................        60%
  January 2014 through December 2014.............................        80%
  January 2015 and thereafter....................................       100%

            Similar Law: As defined in Section 5.02(c).

            Single Certificate: A Certificate of any Class that evidences the
smallest permissible Denomination for such Class, as set forth in Section 11.22.

            Startup Day: As defined in Section 2.05.

            Subordinated Percentage: As to any Distribution Date, the percentage
which is the difference between 100% and the Class A Percentage for such date.

             Subordinated Prepayment Percentage: As to any Distribution Date, the
percentage which is the difference between 100% and the Class A Prepayment
Percentage for such date.

            Subordination Depletion Date: The Distribution Date preceding the
first Distribution Date on which the Class A Percentage (determined pursuant to
clause (ii) of the definition thereof) equals or exceeds 100%.

            Subordination Depletion Date Interest Shortfall: With respect to any
Distribution Date that occurs on or after the Subordination Depletion Date with
respect to any Unscheduled Principal Receipt (other than a Prepayment in Full or
Curtailment):

            (A)    in the case where the Applicable Unscheduled Principal Receipt
                  Period is the Mid-Month Receipt Period and such Unscheduled
                  Principal Receipt is received by the Servicer on or after the
                  Determination Date in the month preceding the month of such
                  Distribution Date but prior to the first day of the month of
                  such Distribution Date, the amount of interest that would have
                  accrued at the Net Mortgage Interest Rate on the amount of
                  such Unscheduled Principal Receipt from the day of its receipt
                  or, if earlier, its application by the Servicer through the
                  last day of the month preceding the month of such Distribution
                  Date; and

            (B)    in the case where the Applicable Unscheduled Principal Receipt
                  Period is the Prior Month Receipt Period and such Unscheduled
                  Principal Receipt is received by the Servicer during the month
                  preceding the month of such Distribution Date, the amount of
                  interest that would have accrued at the Net Mortgage Interest
                  Rate on the amount of such Unscheduled Principal Receipt from
                  the day of its receipt or, if earlier, its application by the
                   Servicer through the last day of the month in which such
                  Unscheduled Principal Receipt is received.

            Subsidy Account: If the Trust Estate contains any Subsidy Loans, the
deposit account or accounts created and maintained by the Servicer for deposit
of Subsidy Funds and amounts payable under interest subsidy agreements relating
to mortgage loans other than the Mortgage Loans.

            Subsidy Funds: If the Trust Estate contains any Subsidy Loans, funds
contributed by the employer of a Mortgagor in order to reduce the payments
required from the Mortgagor for a specified period in specified amounts.

            Subsidy Loan: Any Mortgage Loan subject to a temporary interest
subsidy agreement pursuant to which the monthly interest payments made by the
related Mortgagor will be less than the scheduled monthly interest payments on
such Mortgage Loan, with the resulting difference in interest payments being
provided by the employer of the Mortgagor.

            Substitute Mortgage Loan: As defined in Section 2.02.

            Substitution Principal Amount: With respect to any Mortgage Loan
substituted in accordance with Section 2.02 or pursuant to Section 2.03 or 2.06,
the excess of (x) the unpaid principal balance of the Mortgage Loan which is
substituted for over (y) the unpaid principal balance of the Substitute Mortgage
Loan, each balance being determined as of the date of substitution.

            Trust: The corpus of the trust created by this Agreement.

             Trust Estate: The corpus of the Trust, consisting of the Mortgage
Loans (other than any Fixed Retained Yield), such amounts as may be held from
time to time in the Certificate Account (other than any Fixed Retained Yield),
the rights of the Trustee to receive the proceeds of all insurance policies and
performance bonds, if any, required to be maintained hereunder or under the
related Servicing Agreement, property which secured a Mortgage Loan and which
has been acquired by foreclosure or deed in lieu of foreclosure, the Reserve
Fund, the Rounding Account, the Policy Payment Account, the rights of the
Trustee under the Policy and all other property and rights described in the
first paragraph of Section 2.01(a).

            Trustee: Wachovia Bank, National Association, a national banking
association with its principal office located in Charlotte, North Carolina, or
any successor trustee appointed as herein provided.

            Type 1 Mortgage Loan: Any of the Mortgage Loans identified in
Exhibit F-1 hereto as such Exhibit may be amended from time to time in
connection with a substitution pursuant to Section 2.02, 2.03 or 2.06, serviced
under the Wells Fargo Bank Servicing Agreement and having a Mid-Month Receipt
Period with respect to all types of Unscheduled Principal Receipts.

            Uncertificated Lower-Tier Interest: Any of the Class A-L1 Interest,
Class A-L2 Interest, Class A-L3 Interest, Class A-L4 Interest, Class A-L14
Interest, Class A-L18 Interest, Class A-LPO Interest, Class A-LUR Interest,
Class B-L1 Interest, Class B-L2 Interest, Class B-L3 Interest, Class B-L4
Interest, Class B-L5 Interest and Class B-L6 Interest.

            Unpaid Interest Shortfalls: Each of the Class A Unpaid Interest
Shortfalls, the Class B-1 Unpaid Interest Shortfall, the Class B-2 Unpaid
Interest Shortfall, the Class B-3 Unpaid Interest Shortfall, the Class B-4
Unpaid Interest Shortfall, the Class B-5 Unpaid Interest Shortfall and the Class
B-6 Unpaid Interest Shortfall.

            Unscheduled Principal Amount: The sum for each outstanding Mortgage
Loan (including each defaulted Mortgage Loan with respect to which the related
Mortgaged Property has been acquired by the Trust Estate) of the product of (A)
the Non-PO Fraction for such Mortgage Loan and (B) the sum of the amounts
described in clauses Iy(ii) and Iy(iii) of the definition of Class A Non-PO
Optimal Principal Amount, but without such amount being multiplied by the
Class A Prepayment Percentage.

            Unscheduled Principal Receipt: Any Principal Prepayment or other
recovery of principal on a Mortgage Loan, including, without limitation, the
principal portion of Net Liquidation Proceeds, the principal portion of Net REO
Proceeds, Recoveries and proceeds received from any condemnation award or
proceeds in lieu of condemnation other than that portion of such proceeds
released to the Mortgagor in accordance with the terms of the Mortgage or
Prudent Servicing Practices, but excluding any Liquidation Profits and proceeds
of a repurchase of a Mortgage Loan by the Seller and any Substitution Principal
Amounts.

            Unscheduled   Principal Receipt Period:   Either a Mid-Month Receipt
Period or a Prior Month Receipt Period.

            Upper-Tier Certificate: Any one of the Class A Certificates (other
than that portion of the Class A-R Certificate represented by the Class A-LR
Interest) and the Class B Certificates.

            Upper-Tier Certificate Account: The trust account established and
maintained pursuant to Section 4.01(e).

            Upper-Tier REMIC: One of the two separate REMICs comprising the
Trust Estate, the assets of which consist of the Uncertificated Lower-Tier
Interests and such amounts as shall from time to time be held in the Upper-Tier
Certificate Account.

            U.S. Person: As defined in Section 4.01(g).

            Voting Interest: With respect to any provisions hereof providing for
the action, consent or approval of the Holders of all Certificates evidencing
specified Voting Interests in the Trust Estate, the Class A-12 Certificates will
be entitled to 1% of the aggregate Voting Interest represented by all
Certificates and remaining Class of Certificates will be entitled to a pro rata
portion of the remaining Voting Interest equal to the ratio obtained by dividing
the Principal Balance of such Class by the Class A Principal Balance and the
Class B Principal Balance. Each Certificateholder of a Class will have a Voting
Interest equal to the product of the Voting Interest to which such Class is
collectively entitled and the Percentage Interest in such Class represented by
such Holder's Certificates. With respect to any provisions hereof providing for
action, consent or approval of each Class of Certificates or specified Classes
of Certificates, each Certificateholder of a Class will have a Voting Interest
in such Class equal to such Holder's Percentage Interest in such Class.

            For so long as no MBIA Default has occurred and is continuing, MBIA
shall be entitled to exercise on behalf of the Holders of the Class A-1
Certificates the Voting Interest of such Class unless MBIA has consented in
writing to the exercise of such Voting Interests by such Holders.

            Wells Fargo Bank: Wells Fargo Bank, N.A., or its successor in
interest.

            Wells Fargo Bank Correspondents: The entities identified on a list
provided by Wells Fargo Bank to the Master Servicer, from which Wells Fargo Bank
purchased the Mortgage Loans.

            Wells Fargo Bank Servicing Agreement: The Servicing Agreement
providing for the servicing of the Type 1 Mortgage Loans initially by Wells
Fargo Bank.

            Section 1.02 Acts of Holders.

            (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Agreement to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing. Except as herein otherwise expressly provided, such action
shall become effective when such instrument or instruments are delivered to the
Trustee. Proof of execution of any such instrument or of a writing appointing
any such agent shall be sufficient for any purpose of this Agreement and
conclusive in favor of the Trustee, if made in the manner provided in this
Section 1.02. The Trustee shall promptly notify the Master Servicer in writing
of the receipt of any such instrument or writing.

            (b) The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof. When such
execution is by a signer acting in a capacity other than his or her individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his or her authority. The fact and date of the execution of any such
instrument or writing, or the authority of the individual executing the same,
may also be proved in any other manner which the Trustee deems sufficient.

            (c) The ownership of Certificates (whether or not such Certificates
shall be overdue and notwithstanding any notation of ownership or other writing
thereon made by anyone other than the Trustee and the Authenticating Agent)
shall be proved by the Certificate Register, and none of the Trustee, MBIA, the
Seller or the Master Servicer shall be affected by any notice to the contrary.

            (d) Any request, demand, authorization, direction, notice, consent,
waiver or other action of the Holder of any Certificate shall bind every future
Holder of the same Certificate and the Holder of every Certificate issued upon
the registration of transfer thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Trustee,
MBIA, the Seller or the Master Servicer in reliance thereon, whether or not
notation of such action is made upon such Certificate.

            Section 1.03 Effect of Headings and Table of Contents.

            The Article and Section headings in this Agreement and the Table of
Contents are for convenience of reference only and shall not affect the
interpretation or construction of this Agreement.

            Section 1.04 Benefits of Agreement.

            (a) Nothing in this Agreement or in the Certificates, express or
implied, shall give to any Person, other than the parties to this Agreement and
their successors hereunder and the Holders of the Certificates and MBIA any
benefit or any legal or equitable right, power, remedy or claim under this
Agreement.

            (b) For so long as no MBIA Default has occurred and is continuing,
MBIA shall be a third party beneficiary to this Agreement to the extent of its
rights hereunder and the rights of the Holders of the Class A-1 Certificates.

<PAGE>

                                   ARTICLE II

                          CONVEYANCE OF MORTGAGE LOANS;
                      ORIGINAL ISSUANCE OF THE CERTIFICATES

            Section 2.01 Conveyance of Mortgage Loans.

            (a) The Seller, concurrently with the execution and delivery hereof,
does hereby assign to the Trustee, without recourse all the right, title and
interest of the Seller in and to (a) the Trust Estate, including all interest
(other than the portion, if any, representing the Fixed Retained Yield) and
principal received by the Seller on or with respect to the Mortgage Loans after
the Cut-Off Date (and including scheduled payments of principal and interest due
after the Cut-Off Date but received by the Seller on or before the Cut-Off Date
and Unscheduled Principal Receipts received or applied on the Cut-Off Date, but
not including payments of principal and interest due on the Mortgage Loans on or
before the Cut-Off Date), (b) the Insurance Policies, (c) the obligations of the
Servicers under the Servicing Agreements with respect to the Mortgage Loans, (d)
the right to receive amounts, if any, payable on behalf of any Mortgagor from
the Subsidy Account relating to any Subsidy Loan and (e) proceeds of all the
foregoing. It is agreed and understood by the Seller and the Trustee that it is
not intended that any mortgage loan be included in the Trust Estate that is a
"High-Cost Home Loan" as defined in any of (i) the New Jersey Home Ownership Act
effective November 27, 2003, (ii) the New Mexico Home Loan Protection Act
effective January 1, 2004, (iii) the Massachusetts Predatory Home Loan Practices
Act effective November 7, 2004 or (iv) the Indiana Home Loan Practices Act,
effective January 1, 2005.

            In connection with such assignment, the Seller shall, with respect
to each Mortgage Loan, deliver, or cause to be delivered, to the Custodian, on
or before the Closing Date the following documents or instruments with respect
to each Mortgage Loan.

            (i) The original Mortgage Note either (A) endorsed in blank or (B)
      endorsed as provided in Section 2.01(d), with all prior and intervening
      endorsements as may be necessary to show a complete chain of endorsements
      or with respect to any Mortgage Loan as to which the original Mortgage
      Note has been permanently lost or destroyed and has not been replaced, a
      lost note affidavit with a copy of the Mortgage Note and, in the case of
      any Mortgage Loan originated in the State of New York documented by a
      NYCEMA, the NYCEMA, the new Mortgage Note, if applicable, the consolidated
      Mortgage Note and the consolidated Mortgage;

            (ii) A recorded original assignment of the related Mortgage from
      Wells Fargo Bank assigning the related Mortgage to the Trustee (which may
      be assigned in blank), certified by the recording office, or, if such
      assignment is in the process of being recorded, a copy of the related
      Mortgage transmitted for recordation certified by an officer of Wells
      Fargo Bank or applicable Wells Fargo Bank Correspondent to be a true and
      correct copy of such assignment submitted for recordation; provided,
      however, if recordation is not required as described below, an assignment
      in recordable form (which may be assigned in blank) with respect to the
      related Mortgage;

            (iii) The original of each assumption agreement, modification,
      written assurance or substitution agreement pertaining to such Mortgage
      Note, if any; and

            (iv) For each Mortgage Loan secured by Co-op Shares, the originals
      of the following documents or instruments:

                  (a)    The loan security agreement;

                  (b)    The stock certificate;

                  (c)    The stock power, executed in blank;

                  (d)    The executed proprietary lease;

                  (e)    The executed recognition agreement;

                  (f)    The executed UCC-1 financing statement with evidence of
                        recording thereon; and

                  (g)    The executed UCC-3 financing statements or other
                        appropriate UCC financing statements required by state
                        law, evidencing a complete and unbroken chain from the
                        mortgagee to the Trustee with evidence of recording
                        thereon (or in a form suitable for recordation).

            (b) Following a Document Transfer Event, the Seller shall, with
respect to each Mortgage Loan, deliver, or cause to be delivered, to the
Custodian, within 60 days copies (which may be in electronic form mutually
agreed upon by the Seller and the Custodian) of the following additional
documents or instruments with respect to each Mortgage Loan; provided, however,
that originals of such documents or instruments shall be delivered to the
Custodian if originals are required under the law in which the related Mortgaged
Property is located in order to exercise all remedies available to the Trust
under applicable law following default by the related Mortgagor:

             (i) The original recorded Mortgage with evidence of recordation
      noted thereon or attached thereto, together with any addenda or riders
      thereto, or a copy of such recorded Mortgage with such evidence of
      recordation certified to be true and correct by the appropriate
      governmental recording office; or a copy of such recorded Mortgage with
      such evidence of recordation, or if the original Mortgage has been
      submitted for recordation but has not been returned from the applicable
      public recording office, a copy of the Mortgage certified by an officer of
      Wells Fargo Bank or the applicable Wells Fargo Bank Correspondent to be a
      true and correct copy of the original Mortgage submitted for recordation;

             (ii) The original of each assumption agreement, modification,
      written assurance or substitution agreement pertaining to such Mortgage,
      if any, or, if such document is in the process of being recorded, a copy
      of such document, certified by an officer of Wells Fargo Bank or the
      applicable Wells Fargo Bank Correspondent of such Mortgage Loan or by the
      applicable title insurance company, closing agent, settlement agent,
      escrow agent or closing attorney to be a true and correct copy of such
      document transmitted for recordation, if any;

            (iii) For each MERS Mortgage Loan that is not a MOM Mortgage Loan,
      the original assignment showing MERS as the assignee of the Mortgage, with
      evidence of recording thereon or copies thereof certified by an officer of
      Wells Fargo Bank or the applicable Wells Fargo Bank Correspondent to have
      been submitted for recordation;

            (iv) Each original recorded intervening assignment of the Mortgage
       as may be necessary to show a complete chain of title from the Mortgage
      Loan originator to Wells Fargo Bank or Wells Fargo Home Mortgage, Inc.,
      with evidence of recordation noted thereon or attached thereto, or a copy
      of such assignment with such evidence of recordation to be true and
      correct by the appropriate governmental recording office, or, if any such
      assignment has been submitted for recordation but has not been returned
      from the applicable public recording office or is not otherwise available,
      a copy of such assignment certified by an officer of Wells Fargo Bank or
      the applicable Wells Fargo Bank Correspondent to be a true and correct
      copy of the recorded assignment submitted for recordation; and

            (v) The original policy of the title insurance or certificate of
      title insurance or a written commitment to issue such a title insurance
      policy or certificate of title insurance, or a copy of such title
      insurance certified as true and correct by the applicable insurer or any
      attorney's certificate of title with an Officer's Certificate of Wells
      Fargo Bank or the applicable Wells Fargo Bank Correspondent that such
      attorney's certificate of title is customarily used in lieu of a title
      insurance policy in the jurisdiction in which the related mortgage
      property is located.

            (c) If any assignment of a Mortgage to the Trustee is in the process
      of being recorded on the Closing Date, the Seller shall use its best
      efforts to cause each such original recorded document or certified copy
      thereof to be delivered to the Custodian promptly following its
      recordation, but in no event later than one (1) year following the Closing
      Date. If any Mortgage has been recorded in the name of MERS or its
      designee, no assignment of Mortgage in favor of the Trustee will be
      required to be prepared or delivered and instead, the Master Servicer
      shall take all actions as are necessary to cause the Trust Estate to be
      shown as the owner of the related Mortgage Loan on the records of MERS for
      the purpose of the system of recording transfers of beneficial ownership
      of mortgages maintained by MERS. The Seller shall also cause to be
      delivered to the Custodian any other original mortgage loan document
      included in the Owner Mortgage Loan File if a copy thereof has been
      delivered. The Seller shall pay from its own funds, without any right of
       reimbursement therefor, the amount of any costs, liabilities and expenses
      incurred by the Trust Estate by reason of the failure of the Seller to
      cause to be delivered to the Custodian within one (1) year following the
      Closing Date any assignment of a Mortgage (except with respect to any
      Mortgage recorded in the name of MERS) not delivered to the Custodian on
      the Closing Date.

            In lieu of recording an assignment of any Mortgage the Seller may,
deliver or cause to be delivered to the Custodian the assignment of the Mortgage
Loan to the Trustee in a form suitable for recordation, if (i) with respect to a
particular state the Trustee has received an Opinion of Counsel acceptable to it
that such recording is not required to make the assignment effective against the
parties to the Mortgage or subsequent purchasers or encumbrances of the
Mortgaged Property or (ii) the Seller has been advised by each Rating Agency
that non-recordation in a state will not result in a reduction of the rating
assigned by that Rating Agency at the time of initial issuance of the
Certificates. Set forth on Exhibit K attached hereto is a list of all states
where recordation is required by either Rating Agency to obtain the initial
ratings of the Certificates. The Custodian may rely and shall be protected in
relying upon the information contained in such Exhibit K. In the event that the
Custodian receives notice that recording is required to protect the right, title
and interest of the Trustee in and to any such Mortgage Loan for which
recordation of an assignment has not previously been required, the Custodian
shall promptly notify the Trustee and the Custodian shall within five Business
Days (or such other reasonable period of time mutually agreed upon by the
Custodian and the Trustee) of its receipt of such notice deliver each previously
unrecorded assignment to the related Servicer for recordation.

            (d) Except for Mortgage Notes endorsed in blank, endorsements shall
comply with the following format:

                                WITHOUT RECOURSE
                              PAY TO THE ORDER OF:
                     WACHOVIA BANK, NATIONAL ASSOCIATION, AS
                     TRUSTEE under the pooling and servicing
                           agreement dated as of [date].
                         and its successors and assigns,

          [Wells Fargo Bank, N.A.] or [Wells Fargo Home Mortgage, Inc.]
                             [Signature of Officer]
                           [Officer's Name and Title]

            Except where assignments in blank are authorized or in the case of
any Mortgage registered in the name of MERS, assignments of any Mortgage shall
comply with the following:

                     WACHOVIA BANK, NATIONAL ASSOCIATION, AS
                                     TRUSTEE
                         and its successors and assigns

            Section 2.02 Acceptance by Custodian.

            Subject to the provisions of the following paragraph, pursuant to
the Custodial Agreement, the Custodian, on behalf of the Trustee, will declare
that it holds and will hold the documents delivered to it pursuant to Section
2.01(a) above and the other documents constituting a part of the Owner Mortgage
Loan Files or Retained Mortgage Loan Files (after the occurrence of a Document
Transfer Event) delivered to it in trust, upon the trusts herein set forth, for
the use and benefit of all present and future Certificateholders. Upon execution
of this Agreement, the Custodian will deliver to the Seller and the Trustee an
initial certification in the form of Exhibit N hereto, to the effect that,
except as may be specified in a list of exceptions attached thereto, it has
received the original Mortgage Notes relating to each Mortgage Loan on the
Mortgage Loan Schedule.

            The Custodian will review each Owner Mortgage Loan File within 45
days after execution of this Agreement. The Custodian will deliver no later than
30 days after completion of such review to the Seller and the Trustee a final
certification in the form of Exhibit O hereto to the effect that, except as may
be specified in a list of exceptions attached thereto, all required documents
set forth in Section 2.01(a) have been executed and received and appear regular
on their face, and that such documents relate to the Mortgage Loans identified
in the Mortgage Loan Schedule based on a comparison of the Mortgage Loan
identifying number, Mortgagor name and street address, and in so doing the
Custodian may rely on the purported due execution and genuineness of any such
document and on the purported genuineness of any signature thereon.

            If within such 45 day period the Custodian finds any document
constituting a part of an Owner Mortgage Loan File not to have been executed or
received or to be unrelated to the Mortgage Loans identified in the Mortgage
Loan Schedule or not to appear regular on its face, the Custodian shall promptly
(and in no event more than 30 days after completion of the review) notify the
Trustee and the Trustee shall notify the Seller. The Seller shall have a period
of 60 days after the date of such notice within which to correct or cure any
such defect. The Seller hereby covenants and agrees that, if any material defect
is not so corrected or cured, the Seller will, not later than 60 days after the
Trustee's notice to it referred to above respecting such defect, either (i)
repurchase the related Mortgage Loan or any property acquired in respect thereof
from the Trust Estate at a price equal to (a) 100% of the unpaid principal
balance of such Mortgage Loan plus (b) accrued interest at the Mortgage Interest
Rate less any Fixed Retained Yield, through the last day of the month in which
such repurchase takes place or (ii) if within two years of the Startup Day, or
such other period permitted by the REMIC Provisions, substitute for any Mortgage
Loan to which such material defect relates, a new mortgage loan (a "Substitute
Mortgage Loan") having such characteristics so that the representations and
warranties of the Seller set forth in Section 2.03(b) hereof (other than Section
2.03(b)(i)) would not have been incorrect had such Substitute Mortgage Loan
originally been a Mortgage Loan. In no event shall any Substitute Mortgage Loan
have an unpaid principal balance, as of the date of substitution, greater than
the Scheduled Principal Balance (reduced by the scheduled payment of principal
due on the Due Date in the month of substitution) of the Mortgage Loan for which
it is substituted. In addition, such Substitute Mortgage Loan shall have a
Loan-to-Value Ratio less than or equal to and a Net Mortgage Interest Rate equal
to that of the Mortgage Loan for which it is substituted.

            In the case of a repurchased Mortgage Loan or property, the purchase
price shall be deposited by the Seller in the Certificate Account maintained by
the Master Servicer pursuant to Section 3.01. In the case of a Substitute
Mortgage Loan, the Owner Mortgage Loan File (and Retained Mortgage Loan File, if
required pursuant to Section 2.01(b) hereof) relating thereto shall be delivered
to the Custodian and the Substitution Principal Amount, together with (i)
interest on such Substitution Principal Amount at the applicable Net Mortgage
Interest Rate to the following Due Date of such Mortgage Loan which is being
substituted for and (ii) an amount equal to the aggregate amount of unreimbursed
Periodic Advances in respect of interest previously made by the Servicer, the
Master Servicer or the Trustee with respect to such Mortgage Loan, shall be
deposited in the Certificate Account. The Monthly Payment on the Substitute
Mortgage Loan for the Due Date in the month of substitution shall not be part of
the Trust Estate. Upon receipt by the Custodian of a Request for Release signed
by an officer of the Seller, the Custodian shall release to the Seller the
related Owner Mortgage Loan File (and Retained Mortgage Loan File, if
applicable). The Trustee shall execute and deliver such instrument of transfer
or assignment (or, in the case of a Mortgage Loan registered in the name of MERS
or its designee, the Master Servicer shall cause the applicable Servicer to take
all necessary action to reflect such assignment on the records of MERS), in each
case without recourse, as shall be necessary to vest in the Seller legal and
beneficial ownership of such substituted or repurchased Mortgage Loan or
property. It is understood and agreed that the obligation of the Seller to
substitute a new Mortgage Loan for or repurchase any Mortgage Loan or property
as to which such a material defect in a constituent document exists shall
constitute the sole remedy respecting such defect available to the
Certificateholders or the Trustee on behalf of the Certificateholders. The
failure of the Custodian to give the final certification or the Trustee to give
any notice within the required time periods shall not affect or relieve the
Seller's obligation to repurchase any Mortgage Loan pursuant to this Section
2.02.

            Section 2.03 Representations and Warranties of the Master Servicer
and the Seller.

            (a) The Master Servicer hereby represents and warrants to the
Trustee for the benefit of the Certificateholders that, as of the date of
execution of this Agreement:

            (i) The Master Servicer is a national banking association duly
      chartered and validly existing in good standing under the laws of the
      United States;

            (ii) The execution and delivery of this Agreement by the Master
      Servicer and its performance and compliance with the terms of this
      Agreement will not violate the Master Servicer's corporate charter or
      by-laws or constitute a default (or an event which, with notice or lapse
      of time, or both, would constitute a default) under, or result in the
      breach of, any material contract, agreement or other instrument to which
      the Master Servicer is a party or which may be applicable to the Master
      Servicer or any of its assets;

            (iii) This Agreement, assuming due authorization, execution and
      delivery by the Trustee and the Seller, constitutes a valid, legal and
      binding obligation of the Master Servicer, enforceable against it in
      accordance with the terms hereof subject to applicable bankruptcy,
      insolvency, reorganization, moratorium and other laws affecting the
      enforcement of creditors' rights generally and to general principles of
      equity, regardless of whether such enforcement is considered in a
      proceeding in equity or at law;

            (iv) The Master Servicer is not in default with respect to any order
      or decree of any court or any order, regulation or demand of any federal,
      state, municipal or governmental agency, which default might have
      consequences that would materially and adversely affect the condition
      (financial or other) or operations of the Master Servicer or its
      properties or might have consequences that would affect its performance
      hereunder; and

            (v) No litigation is pending or, to the best of the Master
      Servicer's knowledge, threatened against the Master Servicer which would
      prohibit its entering into this Agreement or performing its obligations
      under this Agreement.

            It is understood and agreed that the representations and warranties
set forth in this Section 2.03(a) shall survive delivery of the respective Owner
Mortgage Loan Files to the Trustee or the Custodian.

            (b) The Seller hereby represents and warrants to the Trustee for the
benefit of Certificateholders that, as of the date of execution of this
Agreement, with respect to the Mortgage Loans, or each Mortgage Loan, as the
case may be:

            (i) The information set forth in the Mortgage Loan Schedule was true
      and correct in all material respects at the date or dates respecting which
      such information is furnished as specified in the Mortgage Loan Schedule;

            (ii) Immediately prior to the transfer and assignment contemplated
      herein, the Seller was the sole owner and holder of the Mortgage Loan free
      and clear of any and all liens, pledges, charges or security interests of
      any nature and has full right and authority to sell and assign the same;

            (iii) The Mortgage is a valid, subsisting and enforceable first lien
      on the property therein described, and the Mortgaged Property is free and
      clear of all encumbrances and liens having priority over the first lien of
      the Mortgage except for liens for real estate taxes and special
      assessments not yet due and payable and liens or interests arising under
      or as a result of any federal, state or local law, regulation or ordinance
      relating to hazardous wastes or hazardous substances, and, if the related
      Mortgaged Property is a condominium unit, any lien for common charges
      permitted by statute or homeowners association fees; and if the Mortgaged
      Property consists of shares of a cooperative housing corporation, any lien
      for amounts due to the cooperative housing corporation for unpaid
      assessments or charges or any lien of any assignment of rents or
      maintenance expenses secured by the real property owned by the cooperative
      housing corporation; and any security agreement, chattel mortgage or
      equivalent document related to, and delivered to the Trustee or to the
      Custodian with, any Mortgage establishes in the Seller a valid and
      subsisting first lien on the property described therein and the Seller has
      full right to sell and assign the same to the Trustee;

            (iv) Neither the Seller nor any prior holder of the Mortgage or the
      related Mortgage Note has modified the Mortgage or the related Mortgage
      Note in any material respect, satisfied, canceled or subordinated the
      Mortgage in whole or in part, released the Mortgaged Property in whole or
      in part from the lien of the Mortgage, or executed any instrument of
      release, cancellation, modification or satisfaction, except in each case
      as is reflected in an agreement delivered to the Trustee or the Custodian
      pursuant to Section 2.01(a);

            (v) All taxes, governmental assessments, insurance premiums, and
      water, sewer and municipal charges, which previously became due and owing
      have been paid, or an escrow of funds has been established, to the extent
      permitted by law, in an amount sufficient to pay for every such item which
      remains unpaid; and the Seller has not advanced funds, or received any
      advance of funds by a party other than the Mortgagor, directly or
      indirectly (except pursuant to any Subsidy Loan arrangement) for the
      payment of any amount required by the Mortgage, except for interest
      accruing from the date of the Mortgage Note or date of disbursement of the
      Mortgage Loan proceeds, whichever is later, to the day which precedes by
      thirty days the first Due Date under the related Mortgage Note;

            (vi) The Mortgaged Property is undamaged by water, fire, earthquake,
      earth movement other than earthquake, windstorm, flood, tornado or similar
      casualty (excluding casualty from the presence of hazardous wastes or
      hazardous substances, as to which the Seller makes no representations), so
      as to affect adversely the value of the Mortgaged Property as security for
      the Mortgage Loan or the use for which the premises were intended and to
      the best of the Seller's knowledge, there is no proceeding pending or
      threatened for the total or partial condemnation of the Mortgaged
      Property;

            (vii) The Mortgaged Property is free and clear of all mechanics' and
      materialmen's liens or liens in the nature thereof; provided, however,
      that this warranty shall be deemed not to have been made at the time of
      the initial issuance of the Certificates if a title policy affording, in
      substance, the same protection afforded by this warranty is furnished to
      the Trustee by the Seller;

             (viii) Except for Mortgage Loans secured by Co-op Shares and
      Mortgage Loans secured by residential long-term leases, the Mortgaged
      Property consists of a fee simple estate in real property; all of the
      improvements which are included for the purpose of determining the
      appraised value of the Mortgaged Property lie wholly within the boundaries
      and building restriction lines of such property and no improvements on
      adjoining properties encroach upon the Mortgaged Property (unless insured
      against under the related title insurance policy); and to the best of the
      Seller's knowledge, the Mortgaged Property and all improvements thereon
      comply with all requirements of any applicable zoning and subdivision laws
       and ordinances;

            (ix) The Mortgage Loan meets, or is exempt from, applicable state,
      federal or local laws, regulations and other requirements, pertaining to
      usury, and the Mortgage Loan is not usurious;

            (x) To the best of the Seller's knowledge, all inspections, licenses
      and certificates required to be made or issued with respect to all
      occupied portions of the Mortgaged Property and, with respect to the use
      and occupancy of the same, including, but not limited to, certificates of
      occupancy and fire underwriting certificates, have been made or obtained
      from the appropriate authorities;

            (xi) All payments required to be made up to the Due Date immediately
      preceding the Cut-Off Date for such Mortgage Loan under the terms of the
      related Mortgage Note have been made and no Mortgage Loan had more than
      one delinquency in the 12 months preceding the Cut-Off Date;

            (xii) The Mortgage Note, the related Mortgage and other agreements
      executed in connection therewith are genuine, and each is the legal, valid
      and binding obligation of the maker thereof, enforceable in accordance
      with its terms, except as such enforcement may be limited by bankruptcy,
      insolvency, reorganization or other similar laws affecting the enforcement
      of creditors' rights generally and by general equity principles
      (regardless of whether such enforcement is considered in a proceeding in
      equity or at law); and, to the best of the Seller's knowledge, all parties
      to the Mortgage Note and the Mortgage had legal capacity to execute the
      Mortgage Note and the Mortgage and each Mortgage Note and Mortgage has
      been duly and properly executed by the Mortgagor;

            (xiii) Each Mortgage Loan at the time it was originated complied in
      all material respects with applicable federal, state and local laws
      including, without limitation, truth-in-lending, real estate settlement
      procedures, consumer credit protection, equal credit opportunity,
      predatory and abusive lending laws and disclosure laws;

            (xiv) The proceeds of the Mortgage Loans have been fully disbursed,
      there is no requirement for future advances thereunder and any and all
      requirements as to completion of any on-site or off-site improvements and
      as to disbursements of any escrow funds therefor have been complied with
      (except for escrow funds for exterior items which could not be completed
      due to weather and escrow funds for the completion of swimming pools); and
      all costs, fees and expenses incurred in making, closing or recording the
      Mortgage Loan have been paid, except recording fees with respect to
      Mortgages not recorded as of the Closing Date;

            (xv) The Mortgage Loan (except any Mortgage Loan secured by a
      Mortgaged Property located in any jurisdiction, as to which an opinion of
      counsel of the type customarily rendered in such jurisdiction in lieu of
      title insurance is instead received) is covered by an American Land Title
      Association mortgagee title insurance policy or other generally acceptable
      form of policy or insurance acceptable to Fannie Mae or Freddie Mac,
      issued by a title insurer acceptable to Fannie Mae or Freddie Mac insuring
      the originator, its successors and assigns, as to the first priority lien
      of the Mortgage in the original principal amount of the Mortgage Loan and
      subject only to (A) the lien of current real property taxes and
      assessments not yet due and payable, (B) covenants, conditions and
      restrictions, rights of way, easements and other matters of public record
      as of the date of recording of such Mortgage acceptable to mortgage
      lending institutions in the area in which the Mortgaged Property is
      located or specifically referred to in the appraisal performed in
      connection with the origination of the related Mortgage Loan, (C) liens
       created pursuant to any federal, state or local law, regulation or
      ordinance affording liens for the costs of clean-up of hazardous
      substances or hazardous wastes or for other environmental protection
      purposes and (D) such other matters to which like properties are commonly
      subject which do not individually, or in the aggregate, materially
      interfere with the benefits of the security intended to be provided by the
      Mortgage; the Seller is the sole insured of such mortgagee title insurance
      policy, the assignment to the Trustee of the Seller's interest in such
      mortgagee title insurance policy does not require any consent of or
      notification to the insurer which has not been obtained or made, such
      mortgagee title insurance policy is in full force and effect and will be
      in full force and effect and inure to the benefit of the Trustee, no
      claims have been made under such mortgagee title insurance policy, and no
      prior holder of the related Mortgage, including the Seller, has done, by
      act or omission, anything which would impair the coverage of such
      mortgagee title insurance policy;

            (xvi) The Mortgaged Property securing each Mortgage Loan is insured
      by an insurer acceptable to Fannie Mae or Freddie Mac against loss by fire
      and such hazards as are covered under a standard extended coverage
      endorsement, in an amount which is not less than the lesser of 100% of the
      insurable value of the Mortgaged Property and the outstanding principal
      balance of the Mortgage Loan, but in no event less than the minimum amount
      necessary to fully compensate for any damage or loss on a replacement cost
      basis; if the Mortgaged Property is a condominium unit, it is included
      under the coverage afforded by a blanket policy for the project; if upon
      origination of the Mortgage Loan, the improvements on the Mortgaged
      Property were in an area identified in the Federal Register by the Federal
      Emergency Management Agency as having special flood hazards, a flood
      insurance policy meeting the requirements of the current guidelines of the
      Federal Insurance Administration is in effect with a generally acceptable
      insurance carrier, in an amount representing coverage not less than the
      least of (A) the outstanding principal balance of the Mortgage Loan, (B)
      the full insurable value of the Mortgaged Property and (C) the maximum
      amount of insurance which was available under the National Flood Insurance
      Act of 1968, as amended; and each Mortgage obligates the Mortgagor
      thereunder to maintain all such insurance at the Mortgagor's cost and
      expense;

            (xvii) To the best of the Seller's knowledge, there is no default,
      breach, violation or event of acceleration existing under the Mortgage or
      the related Mortgage Note and no event which, with the passage of time or
      with notice and the expiration of any grace or cure period, would
      constitute a default, breach, violation or event of acceleration; the
      Seller has not waived any default, breach, violation or event of
      acceleration; and no foreclosure action is currently threatened or has
      been commenced with respect to the Mortgage Loan;

            (xviii) No Mortgage Note or Mortgage is subject to any right of
      rescission, set-off, counterclaim or defense, including the defense of
      usury, nor will the operation of any of the terms of the Mortgage Note or
      Mortgage, or the exercise of any right thereunder, render the Mortgage
      Note or Mortgage unenforceable, in whole or in part, or subject it to any
      right of rescission, set-off, counterclaim or defense, including the
      defense of usury, and no such right of rescission, set-off, counterclaim
      or defense has been asserted with respect thereto;

            (xix) Each Mortgage Note is payable in monthly payments, resulting
      in complete amortization of the Mortgage Loan over a term of not more than
      360 months;

            (xx) Each Mortgage contains customary and enforceable provisions
      such as to render the rights and remedies of the holder thereof adequate
      for the realization against the Mortgaged Property of the benefits of the
      security, including realization by judicial foreclosure (subject to any
      limitation arising from any bankruptcy, insolvency or other law for the
      relief of debtors), and there is no homestead or other exemption available
      to the Mortgagor which would interfere with such right of foreclosure;

            (xxi) To the best of the Seller's knowledge, no Mortgagor is a
      debtor in any state or federal bankruptcy or insolvency proceeding;

            (xxii) Each Mortgaged Property is located in the United States and
      consists of a one- to four-unit residential property, which may include a
      detached home, townhouse, condominium unit or a unit in a planned unit
      development or, in the case of Mortgage Loans secured by Co-op Shares,
      leases or occupancy agreements;

            (xxiii) The Mortgage Loan is a "qualified mortgage" within the
      meaning of Section 860G(a)(3) of the Code;

            (xxiv) With respect to each Mortgage where a lost note affidavit has
      been delivered to the Trustee in place of the related Mortgage Note, the
      related Mortgage Note is no longer in existence;

            (xxv) In the event that the Mortgagor is an inter vivos "living"
      trust, (i) such trust is in compliance with Fannie Mae or Freddie Mac
      standards for inter vivos trusts and (ii) holding title to the Mortgaged
      Property in such trust will not diminish any rights as a creditor
      including the right to full title to the Mortgaged Property in the event
      foreclosure proceedings are initiated;

            (xxvi) If the Mortgage Loan is secured by a long-term residential
      lease, (1) the lessor under the lease holds a fee simple interest in the
      land; (2) the terms of such lease expressly permit the mortgaging of the
      leasehold estate, the assignment of the lease without the lessor's consent
      and the acquisition by the holder of the Mortgage of the rights of the
      lessee upon foreclosure or assignment in lieu of foreclosure or provide
      the holder of the Mortgage with substantially similar protections; (3) the
      terms of such lease do not (a) allow the termination thereof upon the
      lessee's default without the holder of the Mortgage being entitled to
      receive written notice of, and opportunity to cure, such default, (b)
      allow the termination of the lease in the event of damage or destruction
      as long as the Mortgage is in existence, (c) prohibit the holder of the
      Mortgage from being insured (or receiving proceeds of insurance) under the
      hazard insurance policy or policies relating to the Mortgaged Property or
      (d) permit any increase in rent other than pre-established increases set
      forth in the lease; (4) the original term of such lease is not less than
      15 years; (5) the term of such lease does not terminate earlier than five
      years after the maturity date of the Mortgage Note; and (6) the Mortgaged
      Property is located in a jurisdiction in which the use of leasehold
      estates in transferring ownership in residential properties is a widely
      accepted practice;

            (xxvii) No Mortgage Loan is a "high cost" loan as defined under any
      federal, state or local law applicable to such Mortgage Loan at the time
      of its origination; and

            (xxviii) No Mortgage Loan is serviced by the Trustee or an affiliate
      of the Trustee.

            Notwithstanding the foregoing, no representations or warranties are
made by the Seller as to the environmental condition of any Mortgaged Property;
the absence, presence or effect of hazardous wastes or hazardous substances on
any Mortgaged Property; any casualty resulting from the presence or effect of
hazardous wastes or hazardous substances on, near or emanating from any
Mortgaged Property; the impact on Certificateholders of any environmental
condition or presence of any hazardous substance on or near any Mortgaged
Property; or the compliance of any Mortgaged Property with any environmental
laws, nor is any agent, person or entity otherwise affiliated with the Seller
authorized or able to make any such representation, warranty or assumption of
liability relative to any Mortgaged Property. In addition, no representations or
warranties are made by the Seller with respect to the absence or effect of fraud
in the origination of any Mortgage Loan.

            It is understood and agreed that the representations and warranties
set forth in this Section 2.03(b) shall survive delivery of the respective Owner
Mortgage Loan Files (and Retained Mortgage Loan Files, if applicable) to the
Custodian and shall inure to the benefit of the Trustee notwithstanding any
restrictive or qualified endorsement or assignment.

            (c) Upon discovery by any of the Seller, the Master Servicer, the
Trustee or the Custodian that any of the representations and warranties made in
subsection (b) above is not accurate (referred to herein as a "breach") and,
except for a breach of the representation and warranty set forth in subsection
(b)(i), where such breach is a result of the Cut-Off Date Principal Balance of a
Mortgage Loan being greater, by $5,000 or greater, than the Cut-Off Date
Principal Balance of such Mortgage Loan indicated on the Mortgage Loan Schedule,
that such breach materially and adversely affects the interests of the
Certificateholders in the related Mortgage Loan (determined without regard to
the Policy), the party discovering such breach shall give prompt written notice
to the other parties (any Custodian being so obligated under a Custodial
Agreement). Within 60 days of the earlier of its discovery or its receipt of
notice of any such breach, the Seller shall cure such breach in all material
respects or shall either (i) repurchase the Mortgage Loan or any property
acquired in respect thereof from the Trust Estate at a price equal to (A) 100%
of the unpaid principal balance of such Mortgage Loan plus (B) accrued interest
at the Net Mortgage Interest Rate for such Mortgage Loan through the last day of
the month in which such repurchase took place or (ii) if within two years of the
Startup Day, or such other period permitted by the REMIC Provisions, substitute
for such Mortgage Loan in the manner described in Section 2.02. In addition to
the foregoing, if a breach of the representation set forth in clause (b)(xiii)
of this Section 2.03 occurs as a result of a violation of an applicable
predatory or abusive lending law, the Seller shall reimburse the Trust for all
costs and damages including, but not limited to, reasonable attorneys' fees and
costs, incurred by the Trust as a result of the violation of such law (such
amount, the "Reimbursement Amount"). The purchase price of any repurchase
described in this paragraph, the Substitution Principal Amount, if any, plus
accrued interest thereon and the other amounts referred to in Section 2.02, and
any Reimbursement Amount shall be deposited in the Certificate Account. It is
understood and agreed, except with respect to the second preceding sentence,
that the obligation of the Seller to repurchase or substitute for any Mortgage
Loan or property as to which such a breach has occurred and is continuing shall
constitute the sole remedy respecting such breach available to
Certificateholders or the Trustee on behalf of Certificateholders, and such
obligation shall survive until termination of the Trust Estate hereunder.

            Section 2.04 Execution and Delivery of Certificates.

            The Trustee acknowledges (i) the assignment to it of the Mortgage
Loans and (ii) the issuance of and hereby declares that it holds the
Uncertificated Lower-Tier Interests on behalf of the Upper-Tier REMIC and
Certificateholders. The Trustee acknowledges the delivery of the Owner Mortgage
Loan Files to the Custodian, on behalf of the Trustee, and, concurrently with
such delivery, has executed and delivered to or upon the order of the Seller, in
exchange for the Mortgage Loans and Uncertificated Lower-Tier Interests,
together with all other assets included in the definition of "Trust Estate,"
receipt of which is hereby acknowledged, Certificates in authorized
denominations which, together with the Uncertificated Lower-Tier Interests,
evidence ownership of the entire Trust Estate.

            Section 2.05 Designation of Certificates; Designation of Startup Day
and Latest Possible Maturity Date.

            The Seller hereby designates the Classes of Class A Certificates
(other than the Class A-R Certificate) and the Classes of Class B Certificates
as classes of "regular interests" and the Class A-R Interest as the single class
of "residual interest" in the Upper-Tier REMIC for the purposes of Code Sections
860G(a)(1) and 860G(a)(2), respectively. The Seller hereby further designates
the Class A-L1 Interest, Class A-L2 Interest, Class A-L3 Interest, Class A-L4
Interest, Class A-L14 Interest, Class A-L18 Interest, Class A-LPO Interest,
Class A-LUR Interest, Class B-L1 Interest, Class B-L2 Interest, Class B-L3
Interest, Class B-L4 Interest, Class B-L5 Interest and Class B-L6 Interest as
classes of "regular interests" and the Class A-LR Interest as the single class
of "residual interest" in the Lower-Tier REMIC for the purposes of Code Sections
860G(a)(1) and 860G(a)(2), respectively. The Closing Date is hereby designated
as the "Startup Day" of each of the Upper-Tier REMIC and the Lower-Tier REMIC
within the meaning of Code Section 860G(a)(9). The "latest possible maturity
date" of the regular interests in the Upper-Tier REMIC and the Lower-Tier REMIC
is January 25, 2036 for purposes of Code Section 860G(a)(1).

            Section 2.06 Optional Substitution of Mortgage Loans.

            During the three-month period beginning on the Startup Date, the
Seller shall have the right, but not the obligation, in its sole discretion for
any reason, to substitute for any Mortgage Loan a Substitute Mortgage Loan
meeting the requirements of Section 2.02. Any such substitution shall be carried
out in the manner described in Section 2.02. The Substitution Principal Amount,
if any, plus accrued interest thereon and the other amounts referred to in
Section 2.02, shall be deposited in the Certificate Account.

<PAGE>

                                   ARTICLE III

                  ADMINISTRATION OF THE TRUST ESTATE; SERVICING
                               OF THE MORTGAGE LOANS

            Section 3.01 Certificate Account.

            (a) The Master Servicer shall establish and maintain a Certificate
Account for the deposit of funds received by the Master Servicer with respect to
the Mortgage Loans serviced by each Servicer pursuant to each of the Servicing
Agreements. Such account shall be maintained as an Eligible Account. The Master
Servicer shall give notice to each Servicer, MBIA and the Seller of the location
of the Certificate Account and of any change in the location thereof.

            (b) The Master Servicer shall deposit into the Certificate Account
on the day of receipt thereof all amounts received by it from any Servicer
pursuant to any of the Servicing Agreements and shall, in addition, deposit into
the Certificate Account the following amounts, in the case of amounts specified
in clause (i), not later than the Business Day preceding the Distribution Date
on which such amounts are required to be distributed to Certificateholders and,
in the case of the amounts specified in clause (ii), not later than the Business
Day next following the day of receipt and posting by the Master Servicer:

            (i) Periodic Advances pursuant to Section 3.03(a) made by the Master
      Servicer or the Trustee, if any and any amounts deemed received by the
      Master Servicer pursuant to Section 3.01(d); and

            (ii) in the case of any Mortgage Loan that is repurchased by the
      Seller pursuant to Section 2.02, 2.03, 3.08 or 9.01 or that is auctioned
      by the Master Servicer pursuant to Section 3.08, the purchase price
      therefor or, where applicable, any Substitution Principal Amount and any
      amounts received in respect of the interest portion of unreimbursed
      Periodic Advances.

            (c) The Master Servicer shall cause the funds in the Certificate
Account to be invested in Eligible Investments. No such Eligible Investments
will be sold or disposed of at a gain prior to maturity unless the Master
Servicer has received an Opinion of Counsel or other evidence satisfactory to it
that such sale or disposition will not cause the Trust Estate to be subject to
Prohibited Transactions Tax, otherwise subject the Trust Estate to tax, or cause
either of the Upper-Tier REMIC or the Lower-Tier REMIC to fail to qualify as a
REMIC while any Certificates are outstanding. Any amounts deposited in the
Certificate Account prior to the Distribution Date shall be invested for the
account of the Master Servicer and any investment income thereon shall be
additional compensation to the Master Servicer for services rendered under this
Agreement. The amount of any losses incurred in respect of any such investments
shall be deposited in the Certificate Account by the Master Servicer out of its
own funds immediately as realized, without any right of reimbursement therefor
from the Trust Estate.

            (d) For purposes of this Agreement, the Master Servicer will be
deemed to have received from a Servicer on the applicable Remittance Date for
such funds all amounts deposited by such Servicer into the Custodial P&I Account
maintained in accordance with the applicable Servicing Agreement, if such
Custodial P&I Account is not an Eligible Account as defined in this Agreement,
to the extent such amounts are not actually received by the Master Servicer on
such Remittance Date as a result of the bankruptcy, insolvency, receivership or
other financial distress of the depository institution in which such Custodial
P&I Account is being held. To the extent that amounts so deemed to have been
received by the Master Servicer are subsequently remitted to the Master
Servicer, the Master Servicer shall be entitled to retain such amounts.

            Section 3.02 Permitted Withdrawals from the Certificate Account.

            (a) The Master Servicer may, from time to time, make withdrawals
from the Certificate Account for the following purposes (limited, in the case of
Servicer reimbursements, to cases where funds in the respective Custodial P&I
Account are not sufficient therefor):

            (i) to reimburse the Master Servicer, the Trustee or any Servicer
      for Periodic Advances made by the Master Servicer or the Trustee pursuant
      to Section 3.03(a) or any Servicer pursuant to any Servicing Agreement
      with respect to previous Distribution Dates, such right to reimbursement
      pursuant to this subclause (i) being limited to amounts received on or in
      respect of particular Mortgage Loans (including, for this purpose,
      Liquidation Proceeds, REO Proceeds and proceeds from the purchase, sale,
      repurchase or substitution of Mortgage Loans pursuant to Section 2.02,
      2.03, 2.06, 3.08 or 9.01) respecting which any such Periodic Advance was
      made;

            (ii) to reimburse any Servicer, the Master Servicer or the Trustee
      for any Periodic Advances determined in good faith to have become
      Nonrecoverable Advances; provided, however, that any portion of
      Nonrecoverable Advances representing Fixed Retained Yield shall be
      reimbursable only from amounts constituting Fixed Retained Yield and not
      from assets of the Trust Estate;

            (iii) to reimburse the Master Servicer or any Servicer from
      Liquidation Proceeds for Liquidation Expenses and for amounts expended by
      the Master Servicer or any Servicer pursuant hereto or to any Servicing
      Agreement, respectively, in good faith in connection with the restoration
      of damaged property or for foreclosure expenses;

             (iv) from any Mortgagor payment on account of interest or other
      recovery (including Net REO Proceeds) with respect to a particular
      Mortgage Loan, to pay the Master Servicing Fee with respect to such
      Mortgage Loan to the Master Servicer;

            (v) to reimburse the Master Servicer, any Servicer or the Trustee
      (or, in certain cases, the Seller) for expenses incurred by it (including
      taxes paid on behalf of the Trust Estate) and recoverable by or
      reimbursable to it pursuant to Section 3.03(b), 3.03(c) or 6.03 or the
      second sentence of Section 8.13(a) or pursuant to such Servicer's
      Servicing Agreement, provided such expenses are "unanticipated" within the
      meaning of the REMIC Provisions;

             (vi) to pay to the Seller or other purchaser with respect to each
      Mortgage Loan or property acquired in respect thereof that has been
      repurchased or replaced pursuant to Section 2.02, 2.03, 2.06, 3.08 or 9.01
      or auctioned pursuant to Section 3.08, all amounts received thereon and
      not required to be distributed as of the date on which the related
      repurchase or purchase price or Scheduled Principal Balance was
      determined;

            (vii) to remit funds to the Paying Agent in the amounts and in the
      manner provided for herein;

            (viii) to pay to the Master Servicer any interest earned on or
      investment income with respect to funds in the Certificate Account;

            (ix) to pay to the Master Servicer or any Servicer out of
      Liquidation Proceeds allocable to interest the amount of any unpaid Master
      Servicing Fee or Servicing Fee (as adjusted pursuant to the related
      Servicing Agreement) and any unpaid assumption fees, late payment charges
      or other Mortgagor charges on the related Mortgage Loan;

            (x) to pay to the Master Servicer as additional master servicing
      compensation any Liquidation Profits which a Servicer is not entitled to
      pursuant to the applicable Servicing Agreement;

            (xi) to withdraw from the Certificate Account any amount deposited
      in the Certificate Account that was not required to be deposited therein;

            (xii) to clear and terminate the Certificate Account pursuant to
      Section 9.01; and

            (xiii) to pay to Wells Fargo Bank from any Mortgagor payment on
      account of interest or other recovery (including Net REO Proceeds) with
      respect to a particular Mortgage Loan, the Fixed Retained Yield, if any,
      with respect to such Mortgage Loan; provided, however, that with respect
      to any payment of interest received by the Master Servicer in respect of a
      Mortgage Loan (whether paid by the Mortgagor or received as Liquidation
      Proceeds, Insurance Proceeds or otherwise) which is less than the full
      amount of interest then due with respect to such Mortgage Loan, only that
      portion of such payment of interest that bears the same relationship to
      the total amount of such payment of interest as the Fixed Retained Yield
      Rate, if any, in respect of such Mortgage Loan bears to the Mortgage
      Interest Rate shall be allocated to the Fixed Retained Yield with respect
      thereto.

            (b) The Master Servicer shall keep and maintain separate accounting,
on a Mortgage Loan by Mortgage Loan basis, for the purpose of justifying any
payment to and withdrawal from the Certificate Account.

            Section 3.03 Advances by Master Servicer and Trustee.

             (a) In the event an Other Servicer fails to make any required
Periodic Advances of principal and interest on a Mortgage Loan as required by
the related Other Servicing Agreement prior to the Business Day preceding the
Distribution Date occurring in the month during which such Periodic Advance is
due, the Master Servicer shall make Periodic Advances to the extent provided
hereby. In the event Wells Fargo Bank in its capacity as Servicer fails to make
any required Periodic Advances of principal and interest on a Mortgage Loan as
required by the Wells Fargo Bank Servicing Agreement prior to the Business Day
preceding the Distribution Date occurring in the month during which such
Periodic Advance is due, the Trustee shall, to the extent required by Section
8.14, make such Periodic Advance to the extent provided hereby, provided that
the Trustee has previously received the certificate of the Master Servicer
described in the following sentence. The Master Servicer shall certify to the
Trustee with respect to any such Distribution Date (i) the amount of Periodic
Advances required of Wells Fargo Bank in its capacity as Servicer or such Other
Servicer, as the case may be, (ii) the amount actually advanced by Wells Fargo
Bank in its capacity as Servicer or such Other Servicer, (iii) the amount that
the Trustee or Master Servicer is required to advance hereunder and (iv) whether
the Master Servicer has determined that it reasonably believes that such
Periodic Advance is a Nonrecoverable Advance. Amounts advanced by the Trustee or
Master Servicer shall be deposited in the Certificate Account on the Business
Day preceding the related Distribution Date. Notwithstanding the foregoing,
neither the Master Servicer nor the Trustee will be obligated to make a Periodic
Advance that it reasonably believes to be a Nonrecoverable Advance. The Trustee
may conclusively rely for any determination to be made by it hereunder upon the
determination of the Master Servicer as set forth in its certificate.

            (b) To the extent an Other Servicer fails to make an advance on
account of the taxes or insurance premiums with respect to a Mortgage Loan
required pursuant to the related Other Servicing Agreement, the Master Servicer
shall, if the Master Servicer has actual knowledge of such failure of the
Servicer, advance such funds and take such steps as are necessary to pay such
taxes or insurance premiums. To the extent Wells Fargo Bank in its capacity as
Servicer fails to make an advance on account of the taxes or insurance premiums
with respect to a Mortgage Loan required pursuant to the Wells Fargo Bank
Servicing Agreement, the Master Servicer shall, if the Master Servicer knows of
such failure of Wells Fargo Bank in its capacity as Servicer, certify to the
Trustee that such failure has occurred. Upon receipt of such certification, the
Trustee shall advance such funds and take such steps as are necessary to pay
such taxes or insurance premiums.

            (c) The Master Servicer and the Trustee shall each be entitled to be
reimbursed from the Certificate Account for any Periodic Advance made by it
under Section 3.03(a) to the extent described in Section 3.02(a)(i) and (a)(ii).
The Master Servicer and the Trustee shall be entitled to be reimbursed pursuant
to Section 3.02(a)(v) for any advance by it pursuant to Section 3.03(b). The
Master Servicer shall diligently pursue restoration of such amount to the
Certificate Account from the related Servicer. The Master Servicer shall, to the
extent it has not already done so, upon the request of the Trustee, withdraw
from the Certificate Account and remit to the Trustee any amounts to which the
Trustee is entitled as reimbursement pursuant to Section 3.02 (a)(i), (ii) and
(v).

            (d) Except as provided in Section 3.03(a) and (b), neither the
Master Servicer nor the Trustee shall be required to pay or advance any amount
which any Servicer was required, but failed, to deposit in the Certificate
Account.

            Section 3.04 Custodian to Cooperate; Release of Owner Mortgage Loan
Files and Retained Mortgage Loan Files.

            In connection with the deposit by a Servicer into the Certificate
Account of the proceeds from a Liquidated Loan or of a Prepayment in Full, the
Master Servicer or applicable Servicer shall confirm to the Trustee that all
amounts required to be remitted to the Certificate Account in connection with
such Mortgage Loan have been so deposited, and the Master Servicer or applicable
Servicer shall deliver two copies of such Request for Release to the Custodian.
The Custodian shall, within five Business Days of its receipt of such a Request
for Release, release the related Owner Mortgage Loan File (and Retained Mortgage
Loan File, if applicable) to the Master Servicer or such Servicer, as requested
by the Master Servicer or such Servicer. No expenses incurred in connection with
any instrument of satisfaction or deed of reconveyance shall be chargeable to
the Certificate Account.

            From time to time and as appropriate for the servicing or
foreclosure of any Mortgage Loan, including but not limited to, collection under
any insurance policies, or to effect a partial release of any Mortgaged Property
from the lien of the Mortgage, the Servicer of such Mortgage Loan shall deliver
to the Master Servicer or Custodian two copies of a Request for Release. Upon
the Master Servicer's receipt of any such Request for Release, the Master
Servicer shall promptly forward such request in hard copy or in electronic
format acceptable to the Custodian. The Custodian shall, within five Business
Days, release the related Owner Mortgage Loan File (and Retained Mortgage Loan
File, if applicable) to the Master Servicer or such Servicer. Any such Request
for Release shall obligate the Master Servicer or such Servicer, as the case may
be, to return the Owner Mortgage Loan File (and Retained Mortgage Loan File, if
applicable) to the Custodian by the twenty-first day following the release
thereof, unless (i) the Mortgage Loan has been liquidated and the Liquidation
Proceeds relating to the Mortgage Loan have been deposited in the Certificate
Account or (ii) the Owner Mortgage Loan File, Retained Mortgage Loan File, if
applicable, or such document has been delivered to an attorney, or to a public
trustee or other public official as required by law, for purposes of initiating
or pursuing legal action or other proceedings for the foreclosure of the
Mortgaged Property either judicially or non-judicially. Upon receipt of two
copies of a Request for Release stating that such Mortgage Loan was liquidated
and that all amounts received or to be received in connection with such
liquidation which are required to be deposited into the Certificate Account have
been so deposited, or that such Mortgage Loan has become an REO Mortgage Loan,
the Custodian shall amend its records.

            Upon written certification of the Master Servicer or the Servicer
pursuant to clause (ii) of the preceding paragraph, the Trustee shall execute
and deliver to the Master Servicer or such Servicer, as directed by the Master
Servicer, court pleadings, requests for trustee's sale or other documents
necessary to the foreclosure or trustee's sale in respect of a Mortgaged
Property or to any legal action brought to obtain judgment against any Mortgagor
on the Mortgage Note or Mortgage or to obtain a deficiency judgment, or to
enforce any other remedies or rights provided by the Mortgage Note or Mortgage
or otherwise available at law or in equity. Each such certification shall
include a request that such pleadings or documents be executed by the Trustee
and a statement as to the reason such documents or pleadings are required and
that the execution and delivery thereof by the Trustee will not invalidate or
otherwise affect the lien of the Mortgage, except for the termination of such a
lien upon completion of the foreclosure proceeding or trustee's sale.

            Section 3.05 Reports to the Trustee; Annual Compliance Statements.

            (a) Not later than 15 days after each Distribution Date, the Master
Servicer shall deliver to the Trustee a statement setting forth the status of
the Certificate Account as of the close of business on such Distribution Date
stating that all distributions required to be made by the Master Servicer under
this Agreement have been made (or, if any required distribution has not been
made by the Master Servicer, specifying the nature and status thereof) and
showing, for the period covered by such statement, the aggregate amount of
deposits into and withdrawals from such account for each category of deposit and
withdrawal specified in Sections 3.01 and 3.02. Such statement may be in the
form of the then current Fannie Mae monthly accounting report for its Guaranteed
Mortgage Pass-Through Program with appropriate additions and changes, and shall
also include information as to the aggregate unpaid principal balance of all of
the Mortgage Loans as of the close of business as of the last day of the
calendar month immediately preceding such Distribution Date. Copies of such
statement shall be provided by the Trustee to any Certificateholder upon written
request, provided such statement is delivered, or caused to be delivered, by the
Master Servicer to the Trustee.

            (b) The Master Servicer shall deliver to the Trustee on or before
March 30th of each year, a certificate signed by an officer of the Master
Servicer, certifying that (i) such officer has reviewed the activities of the
Master Servicer during the preceding calendar year or portion thereof and its
performance under this agreement, (ii) to the best of such officer's knowledge,
based on such review, the Master Servicer has performed and fulfilled its
duties, responsibilities and obligations under this agreement in all material
respects throughout such year, or, if there has been a default in the
fulfillment of any such duties, responsibilities or obligations, specifying each
such default known to such officer and the nature and status thereof, and, (iii)
(A) the Master Servicer has received from each Servicer any financial
statements, officer's certificates, accountant's statements or other information
required to be provided to the Master Servicer pursuant to the related Servicing
Agreement and (B) to the best of such officer's knowledge, based on a review of
the information provided to the Master Servicer by each Servicer as described in
(iii)(A) above, each Servicer has performed and fulfilled its duties,
responsibilities and obligations under the related Servicing Agreement in all
material respects throughout such year, or, if there has been a default in the
fulfillment of any such duties, responsibilities or obligations, specifying each
such default known to such officer and the nature and status thereof. Copies of
such officers' certificate shall be provided by the Trustee to any
Certificateholder upon written request provided such certificate is delivered,
or caused to be delivered, by the Master Servicer to the Trustee.

            Section 3.06 Title, Management and Disposition of Any REO Mortgage
Loan.

            The Master Servicer shall enforce the obligations of the applicable
Servicer to administer each REO Mortgage Loan at all times so that each REO
Mortgage Loan qualifies as "foreclosure property" under the REMIC Provisions and
that it does not earn any "net income from foreclosure property" which is
subject to tax under the REMIC Provisions. In the event that a Servicer is
unable to dispose of any REO Mortgage Loan within the period mandated by each of
the Servicing Agreements, the Master Servicer shall monitor such Servicer to
verify that such REO Mortgage Loan is auctioned to the highest bidder within the
period so specified. In the event of any such sale of a REO Mortgage Loan, the
Custodian shall, at the written request of the Master Servicer and upon being
supported with appropriate forms therefor, within five Business Days of the
deposit by the Master Servicer of the proceeds of such sale or auction into the
Certificate Account, release or cause to be released to the entity identified by
the Master Servicer the related Owner Mortgage Loan File, Retained Mortgage Loan
File, if applicable, and Servicer Mortgage Loan File and shall execute and
deliver such instruments of transfer or assignment, in each case without
recourse, as shall be necessary to vest in the auction purchaser title to the
REO Mortgage Loan and the Custodian shall have no further responsibility with
regard to such Owner Mortgage Loan File, Retained Mortgage Loan File, if
applicable, or Servicer Mortgage Loan File. Neither the Trustee, the Master
Servicer nor any Servicer, acting on behalf of the Trust Estate, shall provide
financing from the Trust Estate to any purchaser of an REO Mortgage Loan.

            Section 3.07 Amendments to Servicing Agreements, Modification of
Standard Provisions.

            (a) Subject to the prior written consent of the Trustee pursuant to
Section 3.07(b), the Master Servicer from time to time may, to the extent
permitted by the applicable Servicing Agreement, make such modifications and
amendments to such Servicing Agreement as the Master Servicer deems necessary or
appropriate to confirm or carry out more fully the intent and purpose of such
Servicing Agreement and the duties, responsibilities and obligations to be
performed by the Servicer thereunder. Such modifications may only be made if
they are consistent with the REMIC Provisions, as evidenced by an Opinion of
Counsel. Prior to the issuance of any modification or amendment, the Master
Servicer shall deliver to the Trustee such Opinion of Counsel and an Officer's
Certificate setting forth (i) the provision that is to be modified or amended,
(ii) the modification or amendment that the Master Servicer desires to issue and
(iii) the reason or reasons for such proposed amendment or modification.

            (b) The Trustee shall consent to any amendment or supplement to a
Servicing Agreement proposed by the Master Servicer pursuant to Section 3.07(a),
which consent and amendment shall not require the consent of any
Certificateholder if it is (i) for the purpose of curing any mistake or
ambiguity or to further effect or protect the rights of the Certificateholders
or (ii) for any other purpose, provided such amendment or supplement for such
other purpose cannot reasonably be expected to adversely affect
Certificateholders. The lack of reasonable expectation of an adverse effect on
Certificateholders may be established through the delivery to the Trustee of (i)
an Opinion of Counsel to such effect or (ii) written notification from each
Rating Agency to the effect that such amendment or supplement will not result in
reduction of the current rating assigned by that Rating Agency to the
Certificates. Notwithstanding the two immediately preceding sentences, the
Trustee may, in its discretion, decline to enter into or consent to any such
supplement or amendment if its own rights, duties or immunities shall be
adversely affected.

            (c)(i) Notwithstanding anything to the contrary in this Section
3.07, the Master Servicer from time to time may, without the consent of any
Certificateholder or the Trustee, enter into an amendment (A) to an Other
Servicing Agreement for the purpose of (i) eliminating or reducing Month End
Interest and (ii) providing for the remittance of Full Unscheduled Principal
Receipts by the applicable Servicer to the Master Servicer not later than the
24th day of each month (or if such day is not a Business Day, on the previous
Business Day) or (B) to the Wells Fargo Bank Servicing Agreement for the purpose
of changing the applicable Remittance Date to the 18th day of each month (or if
such day is not a Business Day, on the previous Business Day).

            (ii) The Master Servicer may direct Wells Fargo Bank in its capacity
as Servicer to enter into an amendment to the Wells Fargo Bank Servicing
Agreement for the purposes described in Section 3.07(c)(i)(B).

            Section 3.08 Oversight of Servicing.

            The Master Servicer shall supervise, monitor and oversee the
servicing of the Mortgage Loans by each Servicer and the performance by each
Servicer of all services, duties, responsibilities and obligations (including
the obligation to maintain an Errors and Omissions Policy and Fidelity Bond)
that are to be observed or performed by the Servicer under its respective
Servicing Agreement. In performing its obligations hereunder, the Master
Servicer shall act in a manner consistent with Accepted Master Servicing
Practices and in a manner consistent with the terms and provisions of any
insurance policy required to be maintained by the Master Servicer or any
Servicer pursuant to this Agreement or any Servicing Agreement. The Master
Servicer acknowledges that prior to taking certain actions required to service
the Mortgage Loans, each Servicing Agreement provides that the Servicer
thereunder must notify, consult with, obtain the consent of or otherwise follow
the instructions of the Master Servicer. The Master Servicer is also given
authority to waive compliance by a Servicer with certain provisions of its
Servicing Agreement. In each such instance, the Master Servicer shall promptly
instruct such Servicer or otherwise respond to such Servicer's request. In no
event will the Master Servicer instruct such Servicer to take any action, give
any consent to action by such Servicer or waive compliance by such Servicer with
any provision of such Servicer's Servicing Agreement if any resulting action or
failure to act would be inconsistent with the requirements of the Rating
Agencies that rated the Certificates or would otherwise have an adverse effect
on the Certificateholders. Any such action or failure to act shall be deemed to
have an adverse effect on the Certificateholders if such action or failure to
act either results in (i) the downgrading of the rating assigned by either
Rating Agency to the Certificates, (ii) the loss by the Upper-Tier REMIC or the
Lower-Tier REMIC of REMIC status for federal income tax purposes or (iii) the
imposition of any Prohibited Transaction Tax or any federal taxes on any of the
Upper-Tier REMIC, the Lower-Tier REMIC or the Trust Estate. The Master Servicer
shall have full power and authority in its sole discretion to take any action
with respect to the Trust Estate as may be necessary or advisable to avoid the
circumstances specified including clause (ii) or (iii) of the preceding
sentence.

             For the purposes of determining whether any modification of a
Mortgage Loan shall be permitted by the Master Servicer, such modification shall
be construed as a substitution of the modified Mortgage Loan for the Mortgage
Loan originally deposited in the Trust Estate if it would be a "significant
modification" within the meaning of Section 1.860G-2(b) of the regulations of
the U.S. Department of the Treasury. No modification shall be approved unless
(i) the modified Mortgage Loan would qualify as a Substitute Mortgage Loan under
Section 2.02 and (ii) with respect to any modification that occurs more than
three months after the Closing Date and is not the result of a default or a
reasonably foreseeable default under the Mortgage Loan, there is delivered to
the Trustee an Opinion of Counsel (at the expense of the party seeking to modify
the Mortgage Loan) to the effect that such modification would not be treated as
giving rise to a new debt instrument for federal income tax purposes as
described in the preceding sentence; provided, however, that no such Opinion of
Counsel need be delivered if the sole purpose of the modification is to reduce
the Monthly Payment on a Mortgage Loan as a result of a Curtailment such that
the Mortgage Loan is fully amortized by its original maturity date.

            During the term of this Agreement, the Master Servicer shall consult
fully with each Servicer as may be necessary from time to time to perform and
carry out the Master Servicer's obligations hereunder and otherwise exercise
reasonable efforts to cause such Servicer to perform and observe the covenants,
obligations and conditions to be performed or observed by it under its Servicing
Agreement.

            The relationship of the Master Servicer to the Trustee under this
Agreement is intended by the parties to be that of an independent contractor and
not that of a joint venturer, partner or agent.

            The Master Servicer shall administer the Trust Estate on behalf of
the Trustee and shall have full power and authority, acting alone or (subject to
Section 6.06) through one or more subcontractors, to do any and all things in
connection with such administration which it may deem necessary or desirable.
Upon the execution and delivery of this Agreement, and from time to time as may
be required thereafter, the Trustee shall furnish the Master Servicer or its
subcontractors with any powers of attorney and such other documents as may be
necessary or appropriate to enable the Master Servicer to carry out its
administrative duties hereunder.

            The Seller shall have a limited option to repurchase any defaulted
Mortgage Loan or REO Mortgage Loan during the following time periods: (i)
beginning on the first day of the second month following the month in which the
Master Servicer has reported that a Servicer has initiated foreclosure
proceedings with respect to such a defaulted Mortgage Loan, with such repurchase
option expiring on the last day of such second following month; (ii) beginning
on the first day of the second month following the month in which the Master
Servicer has reported that such defaulted Mortgage Loan has become an REO
Mortgage Loan, with such repurchase option expiring on the last day of such
second following month; and (iii) beginning on the day on which a Servicer
accepts a contractual commitment by a third party to purchase the Mortgaged
Property related to the defaulted Mortgage Loan or REO Mortgage Loan, with such
repurchase option expiring on the earlier of the last day of the month in which
such contractual commitment was accepted by the Servicer or the day immediately
prior to the day on which the closing occurs with respect to such third party
purchase of the Mortgaged Property related to the defaulted Mortgage Loan or REO
Mortgage Loan. The Seller shall be entitled to repurchase at its option any
Mortgage Loan in the Trust Estate which, pursuant to paragraph 5(b) of the
Mortgage Loan Purchase Agreement, Wells Fargo Bank requests the Seller to
repurchase and to sell to Wells Fargo Bank to facilitate the exercise of Wells
Fargo Bank's rights against the originator or a prior holder of such Mortgage
Loan. The purchase price for any Mortgage Loan repurchased pursuant to this
paragraph shall be 100% of the unpaid principal balance of such Mortgage Loan
plus accrued interest thereon at the Mortgage Interest Rate for such Mortgage
Loan, through the last day of the month in which such repurchase occurs. Upon
the receipt of such purchase price, the Master Servicer shall provide to the
Trustee the certification required by Section 3.04 and the Trustee and the
Custodian, if any, shall promptly release to the Seller the Owner Mortgage Loan
File and Retained Mortgage Loan File, if applicable, relating to the Mortgage
Loan being repurchased.

             In the event that (i) the Master Servicer determines at any time
that, notwithstanding the representations and warranties set forth in Section
2.03(b), any Mortgage Loan is not a "qualified mortgage" within the meaning of
Section 860G of the Code and (ii) the Trustee is unable to enforce the
obligation of the Seller to purchase such Mortgage Loan pursuant to Section 2.02
within two months of such determination, the Master Servicer shall cause such
Mortgage Loan to be auctioned to the highest bidder and sold out of the Trust
Estate no later than the date 90 days after such determination. In the event of
any such sale of a Mortgage Loan, the Custodian shall, at the written request of
the Master Servicer and upon being supported with appropriate forms therefor,
within five Business Days of the deposit by the Master Servicer of the proceeds
of such auction into the Certificate Account, release or cause to be released to
the entity identified by the Master Servicer the related Owner Mortgage Loan
File, Retained Mortgage Loan File, if applicable, and Servicer Mortgage Loan
File and shall execute and deliver such instruments of transfer or assignment,
in each case without recourse, as shall be necessary to vest in the auction
purchaser title to the Mortgage Loan and the Custodian shall have no further
responsibility with regard to such Owner Mortgage Loan File, Retained Mortgage
Loan File, if applicable, or Servicer Mortgage Loan File. None of the Trustee,
the Custodian, the Master Servicer or any Servicer, acting on behalf of the
Trustee, shall provide financing from the Trust Estate to any purchaser of a
Mortgage Loan.

            The Master Servicer, on behalf of the Trustee, shall, pursuant to
the Servicing Agreements, object to the foreclosure upon, or other related
conversion of the ownership of, any Mortgaged Property by the related Servicer
if (i) the Master Servicer believes such Mortgaged Property may be contaminated
with or affected by hazardous wastes or hazardous substances or (ii) such
Servicer does not agree to administer such Mortgaged Property, once the related
Mortgage Loan becomes an REO Mortgage Loan, in a manner which would not result
in a federal tax being imposed upon the Trust Estate or the Upper-Tier REMIC or
the Lower-Tier REMIC.

             At the direction of the Seller, the Master Servicer may enter into a
special servicing agreement with an unaffiliated holder of 100% Percentage
Interest of a Class of Class B Certificates or a holder of a class of securities
representing interests in the Class B Certificates and/or other subordinated
mortgage pass-through certificates, such agreement to be substantially in the
form of Exhibit M hereto or subject to each Rating Agency's acknowledgment that
the ratings of the Certificates in effect immediately prior to the entering into
of such agreement would not be qualified, downgraded or withdrawn and the
Certificates would not be placed on credit review status (except for possible
upgrading) (without, in the case of the Class A-1 Certificates, giving effect to
the guaranty provided by MBIA) as a result of such agreement. Any such agreement
may contain provisions whereby such holder may instruct the Master Servicer to
instruct a Servicer to the extent provided in the applicable Servicing Agreement
to commence or delay foreclosure proceedings with respect to delinquent Mortgage
Loans and will contain provisions for the deposit of cash by the holder that
would be available for distribution to Certificateholders if Liquidation
Proceeds are less than they otherwise may have been had the Servicer acted in
accordance with its normal procedures.

            Section 3.09 Termination and Substitution of Servicing Agreements.

            Upon the occurrence of any event for which a Servicer may be
terminated pursuant to its Servicing Agreement, the Master Servicer shall
promptly deliver to the Seller, MBIA and the Trustee an Officer's Certificate
certifying that an event has occurred which may justify termination of such
Servicing Agreement, describing the circumstances surrounding such event and
recommending what action should be taken by the Trustee with respect to such
Servicer. If the Master Servicer recommends that such Servicing Agreement be
terminated, the Master Servicer's certification must state that the breach is
material and not merely technical in nature. Based upon such certification, the
Master Servicer, or if provided by the applicable Other Servicing Agreement and
upon written direction of the Master Servicer, the Trustee, shall promptly
terminate such Other Servicing Agreement. The Trustee shall terminate the Wells
Fargo Bank Servicing Agreement in accordance with the provisions of Article 19
thereof. The Master Servicer shall indemnify the Trustee and hold it harmless
from and against any and all claims, liabilities, costs and expenses (including,
without limitation, reasonable attorneys' fees) arising out of, or assessed
against the Trustee in connection with termination of a Servicing Agreement at
the direction of the Master Servicer except to the extent that such claims,
liabilities, costs and expenses are incurred as a result of the bad faith,
willful misfeasance or gross negligence of the Trustee in the performance of its
obligations hereunder. To the extent that the costs and expenses (including any
amounts paid by the Master Servicer pursuant to the immediately preceding
sentence) of the Master Servicer related to any termination of a Servicer,
appointment of a successor Servicer or the transfer and assumption of servicing
by the Master Servicer with respect to any Servicing Agreement (including,
without limitation, (i) all legal costs and expenses and all due diligence costs
and expenses associated with an evaluation of the potential termination of the
Servicer as a result of an event of default by such Servicer and (ii) all costs
and expenses associated with the complete transfer of servicing, including all
servicing files and all servicing data and the completion, correction or
manipulation of such servicing data as may be required by the successor servicer
to correct any errors or insufficiencies in the servicing data or otherwise to
enable the successor servicer to service the Mortgage Loans in accordance with
the related Servicing Agreement) are not fully and timely reimbursed by the
terminated Servicer, the Master Servicer shall be entitled to reimbursement of
such costs and expenses from the Certificate Account. If the Master Servicer or
Trustee terminates an Other Servicing Agreement, the Trustee may enter into a
substitute Servicing Agreement with the Master Servicer or, at the Master
Servicer's nomination, with another mortgage loan service company acceptable to
the Trustee, the Master Servicer and each Rating Agency under which the Master
Servicer or such substitute servicer, as the case may be, shall assume, satisfy,
perform and carry out all liabilities, duties, responsibilities and obligations
that are to be, or otherwise were to have been, satisfied, performed and carried
out by such Servicer under such terminated Servicing Agreement. If the Trustee
terminates the Wells Fargo Bank Servicing Agreement, the Trustee shall enter
into a substitute Servicing Agreement with another mortgage loan service company
acceptable to the Trustee and each Rating Agency under which such substitute
servicer shall assume, satisfy, perform and carry out all liabilities, duties,
responsibilities and obligations that are to be, or otherwise were to have been,
satisfied, performed and carried out by Wells Fargo Bank, in its capacity as
Servicer, under such terminated Servicing Agreement. It is understood and
acknowledged by the parties hereto that there will be a period of transition not
to exceed ninety (90) days before the servicing functions can be transferred to
such substitute servicer. Until such time as the Trustee enters into a
substitute servicing agreement with respect to the Mortgage Loans previously
serviced by an Other Servicer and the transition period relating to the transfer
of such servicing expires, the Master Servicer shall assume, satisfy, perform
and carry out all obligations which otherwise were to have been satisfied,
performed and carried out by an Other Servicer under its terminated Servicing
Agreement. However, in no event shall the Master Servicer be deemed to have
assumed the obligations of a Servicer to advance payments of principal and
interest on a delinquent Mortgage Loan in excess of the Master Servicer's
independent Periodic Advance obligation under Section 3.03 of this Agreement. As
compensation for the Master Servicer of any servicing obligations fulfilled or
assumed by the Master Servicer, the Master Servicer shall be entitled to any
servicing compensation to which a Servicer would have been entitled if the
Servicing Agreement with such Servicer had not been terminated.

             Section 3.10 Application of Net Liquidation Proceeds.

            For all purposes under this agreement, Net Liquidation Proceeds
received from a Servicer shall be allocated first to accrued and unpaid interest
on the related Mortgage Loan and then to the unpaid principal balance thereof.

            Section 3.11 Exchange Act Reports.

            (a) With respect to each Distribution Date, prior to the issuance of
the related Distribution Date Statement, the Master Servicer shall confirm that
it has received all distribution and/or servicing information required to be
provided to the Master Servicer by each Servicer for inclusion in such
Distribution Date Statement. In the event the Master Servicer determines that
any such information has not been provided as required or is materially
incorrect, the Master Servicer shall immediately notify the applicable Servicer
and use its reasonable best efforts to cause the Servicer to provide or correct,
as the case may be, such information promptly (but in any event in time to
permit the Master Servicer to distribute the Distribution Date Statement at the
time required in this Agreement).

            (b) Promptly upon receipt by the Master Servicer of (i) any
officer's certificate relating to any Servicer's annual compliance with the
terms of the applicable Servicing Agreement and (ii) any report of any
Servicer's independent public accountants relating to the Servicer's compliance
with servicing standards, as required under the applicable Servicing Agreement,
the Master Servicer shall review such officer's certificate and reports. As part
of the Form 10-K required to be filed pursuant to paragraph (c) of this Section
3.11, the Master Servicer shall include each such Servicer's annual statement of
compliance, and each such accountant's report, as well as a report of any
significant deficiencies relating to any Servicer's performance of its
obligations under the applicable Servicing Agreement.

            (c) The Master Servicer shall reasonably cooperate with the Seller
to enable the Trust to satisfy its reporting requirements under the Exchange
Act. The Master Servicer shall prepare on behalf of the Trust any Forms 8-K and
10-K customary for similar securities as required by the Exchange Act and the
rules and regulations promulgated thereunder, and the Master Servicer shall sign
and file (via the Securities and Exchange Commission's Electronic Data Gathering
and Retrieval System) such forms on behalf of the Trust.

            (d) Each Form 8-K shall be filed by the Master Servicer within 15
days after each Distribution Date, which shall include a copy of the
Distribution Date Statement to Certificateholders for such Distribution Date as
an exhibit thereto. Prior to March 30th of each year (or such earlier date as
may be required by the Exchange Act and the rules and regulations promulgated
thereunder), the Master Servicer shall file a Form 10-K, in substance as
required by applicable law or applicable Securities and Exchange Commission
staff's interpretations. Such Form 10 K shall include as exhibits (i) the annual
statement of compliance of the Master Servicer required to be delivered pursuant
to Section 3.05(b) and (ii) with respect to each Servicer, the annual statements
of compliance, the accountant's reports and any report of significant
deficiencies relating to any Servicer's performance of its obligations under the
applicable Servicing Agreement, each as described in paragraph (b) of this
Section 3.11, in each case to the extent they have been timely delivered to the
Master Servicer. Each Form 10-K shall also include a certification in the form
attached hereto as Exhibit P or in such other form as may be required by Rules
13a-14 and 15d-14 under the Exchange Act, as applicable, and any directives or
interpretations thereof by the Securities and Exchange Commission (the
"Certification"), which shall be signed by a Master Servicing Officer.

            (e) Unless otherwise instructed by the Seller, prior to January 30th
of the first year in which the Master Servicer is able to do so under applicable
law, the Master Servicer shall file a Form 15 Suspension Notification with
respect to the Trust. At any time after the filing of a Form 15 Suspension
Notification, if the number of Certificateholders of record exceeds the number
set forth in Section 15(d) of the Exchange Act or the regulations promulgated
pursuant thereto which would cause the Trust to again become subject to the
reporting requirements of the Exchange Act, the Master Servicer shall recommence
preparing and filing reports on Form 8-K and 10-K as required pursuant to this
Section 3.11.

<PAGE>

                                   ARTICLE IV

                    DISTRIBUTIONS IN RESPECT OF CERTIFICATES;
                         PAYMENTS TO CERTIFICATEHOLDERS;
                             STATEMENTS AND REPORTS

            Section 4.01 Distributions.

            (a) On each Distribution Date, the Pool Distribution Amount will be
applied in the following amounts, to the extent the Pool Distribution Amount is
sufficient therefor, in the manner and in the order of priority as follows:

            first, to the Classes of Class A Certificates and to MBIA, pro rata,
based upon their respective Interest Accrual Amounts and the Premium Payment,
respectively, in an aggregate amount up to the sum of the Class A Interest
Accrual Amount and the Premium Payment with respect to such Distribution Date;
provided that prior to the Accretion Termination Date, an amount equal to the
amount that would otherwise be distributable in respect of interest to the
Accrual Certificates pursuant to this provision will instead be distributed in
reduction of the Principal Balances of certain Classes of Class A Certificates,
in accordance with Section 4.01(b);

            second, to the Classes of Class A Certificates and to MBIA, pro
rata, based upon their respective Class A Unpaid Interest Shortfalls and Premium
Unpaid Shortfall, respectively, in an aggregate amount up to the sum of the
Aggregate Class A Unpaid Interest Shortfall and the Premium Unpaid Shortfall;
provided that prior to the Accretion Termination Date, an amount equal to the
amount that would otherwise be distributable in respect of unpaid interest
shortfalls to the Accrual Certificates pursuant to this provision will instead
be distributed in reduction of the Principal Balances of certain Classes of
Class A Certificates, in accordance with Section 4.01(b);

            third, concurrently, to the Class A Certificates (other than the
Class A-PO Certificates) and the Class A-PO Certificates, pro rata, based on
their respective Class A Non-PO Optimal Principal Amount and Class A-PO Optimal
Principal Amount, (1) to the Classes of Class A Certificates (other than the
Class A-PO Certificates), in an aggregate amount up to the Class A Non-PO
Optimal Principal Amount, such distribution to be allocated among such Classes
in accordance with Section 4.01(b) or Section 4.01(c), as applicable, and (2) to
the Class A-PO Certificates in an amount up to the Class A-PO Optimal Principal
Amount;

            fourth, to the Class A-PO Certificates in an amount up to the Class
A-PO Deferred Amount from amounts otherwise distributable (without regard to
this Paragraph fourth) first to the Class B-6 Certificates pursuant to Paragraph
twenty-second, below, second to the Class B-5 Certificates pursuant to Paragraph
nineteenth, below, third to the Class B-4 Certificates pursuant to Paragraph
sixteenth, below, fourth to the Class B-3 Certificates pursuant to Paragraph
thirteenth, below, fifth to the Class B-2 Certificates pursuant to Paragraph
tenth below, and sixth to the Class B-1 Certificates pursuant to Paragraph
seventh below;

            fifth, to the Class B-1 Certificates in an amount up to the Interest
Accrual Amount for the Class B-1 Certificates with respect to such Distribution
Date;

            sixth, to the Class B-1 Certificates in an amount up to the Class
B-1 Unpaid Interest Shortfall;

            seventh, to the Class B-1 Certificates in an amount up to the Class
B-1 Optimal Principal Amount; provided, however, that the amount distributable
to the Class B-1 Certificates pursuant to this Paragraph seventh will be reduced
by the amount, if any, that would have been distributable to the Class B-1
Certificates hereunder used to pay the Class A-PO Deferred Amount as provided in
Paragraph fourth above;

            eighth, to the Class B-2 Certificates in an amount up to the
Interest Accrual Amount for the Class B-2 Certificates with respect to such
Distribution Date;

            ninth, to the Class B-2 Certificates in an amount up to the Class
B-2 Unpaid Interest Shortfall;

            tenth, to the Class B-2 Certificates in an amount up to the Class
B-2 Optimal Principal Amount; provided, however, that the amount distributable
to the Class B-2 Certificates pursuant to this Paragraph tenth will be reduced
by the amount, if any, that would have been distributable to the Class B-2
Certificates hereunder used to pay the Class A-PO Deferred Amount as provided in
Paragraph fourth above;

             eleventh, to the Class B-3 Certificates in an amount up to the
Interest Accrual Amount for the Class B-3 Certificates with respect to such
Distribution Date;

            twelfth, to the Class B-3 Certificates in an amount up to the Class
B-3 Unpaid Interest Shortfall;

            thirteenth, to the Class B-3 Certificates in an amount up to the
Class B-3 Optimal Principal Amount; provided, however, that the amount
distributable to the Class B-3 Certificates pursuant to this Paragraph
thirteenth will be reduced by the amount, if any, that would have been
distributable to the Class B-3 Certificates hereunder used to pay the Class A-PO
Deferred Amount as provided in Paragraph fourth above;

            fourteenth, to the Class B-4 Certificates in an amount up to the
Interest Accrual Amount for the Class B-4 Certificates with respect to such
Distribution Date;

            fifteenth, to the Class B-4 Certificates in an amount up to the
Class B-4 Unpaid Interest Shortfall;

            sixteenth, to the Class B-4 Certificates in an amount up to the
Class B-4 Optimal Principal Amount; provided, however, that the amount
distributable to the Class B-4 Certificates pursuant to this Paragraph sixteenth
will be reduced by the amount, if any, that would have been distributable to the
Class B-4 Certificates hereunder used to pay the Class A-PO Deferred Amount as
provided in Paragraph fourth above;

            seventeenth, to the Class B-5 Certificates in an amount up to the
Interest Accrual Amount for the Class B-5 Certificates with respect to such
Distribution Date;

            eighteenth, to the Class B-5 Certificates in an amount up to the
Class B-5 Unpaid Interest Shortfall;

            nineteenth, to the Class B-5 Certificates in an amount up to the
Class B-5 Optimal Principal Amount; provided, however, that the amount
distributable to the Class B-5 Certificates pursuant to this Paragraph
nineteenth will be reduced by the amount, if any, that would have been
distributable to the Class B-5 Certificates hereunder used to pay the Class A-PO
Deferred Amount as provided in Paragraph fourth above;

            twentieth, to the Class B-6 Certificates in an amount up to the
Interest Accrual Amount for the Class B-6 Certificates with respect to such
Distribution Date;

             twenty-first, to the Class B-6 Certificates in an amount up to the
Class B-6 Unpaid Interest Shortfall;

            twenty-second, to the Class B-6 Certificates in an amount up to the
Class B-6 Optimal Principal Amount; provided, however, that the amount
distributable to the Class B-6 Certificates pursuant to this Paragraph
twenty-second will be reduced by the amount, if any, that would have been
distributable to the Class B-6 Certificates hereunder used to pay the Class A-PO
Deferred Amount as provided in Paragraph fourth above; and

            twenty-third, to the Holder of the Class A-R Certificate (i) in
respect of the Class A-R Interest, any amounts remaining in the Upper-Tier
Certificate Account and (ii) in respect of the Class A-LR Interest, any amounts
remaining in the Payment Account.

            Notwithstanding the foregoing, after the Principal Balance or
Notional Amount of any Class has been reduced to zero, such Class will be
entitled to no further distributions of principal or interest (including,
without limitation, any Unpaid Interest Shortfalls). In addition, MBIA will not
be entitled to its Premium Payments and Premium Unpaid Shortfalls after the
Principal Balance of the Class A-1 Certificates has been reduced to zero.

             With respect to any Distribution Date, the amount of the Principal
Adjustment, if any, attributable to any Class of Class B Certificates will be
allocated to the Classes of Class A Certificates (other than the Class A-PO
Certificates) and any Class of Class B Certificates with a lower numerical
designation pro rata based on their outstanding Principal Balances.

            On each Distribution Date, any Reimbursement Amount shall be
distributed sequentially to the Classes of Certificates then outstanding which
bore the loss to which such Reimbursement Amount relates beginning with the most
senior of such Class of Certificates, up to, with respect to each Class, the
amount of loss borne by such Class. Any Reimbursement Amount remaining after the
application described in the preceding sentence shall be included in the Pool
Distribution Amount.

                  (iii) Distributions on the Uncertificated Lower-Tier
Interests. Each Uncertificated Lower-Tier Interest shall receive distributions
in respect of principal in an amount equal to the amount of principal
distributed to its respective Corresponding Upper-Tier Class or Classes as
provided herein. Each Uncertificated Lower-Tier Interest (other than the Class
A-L14 Interest and Class A-LPO Interest) shall receive distributions in respect
of interest in an amount equal to the Interest Accrual Amounts and Unpaid
Interest Shortfalls, as the case may be, in respect of its Corresponding
Upper-Tier Class or Classes, in each case to the extent actually distributed
thereon (or, in the case of the Accrual Certificates, added to its Principal
Balance). Such amounts distributed to the Uncertificated Lower-Tier Interests in
respect of principal and interest with respect to any Distribution Date are
referred to herein collectively as the "Lower-Tier Distribution Amount."

            As of any date, the principal balance of each Uncertificated
Lower-Tier Interest equals the Principal Balances of the respective
Corresponding Upper-Tier Class or Classes, or in the case of the Class A-L3
Interest, the aggregate Principal Balance of the Class A-3, Class A-5 and Class
A-11 Certificates. The initial principal balance of each Uncertificated
Lower-Tier Interest equals the Original Principal Balances of the respective
Corresponding Upper-Tier Class or Classes, or in the case of the Class A-L3
Interest, the aggregate Original Principal Balance of the Class A-3, Class A-5
and Class A-11 Certificates.

            The pass-through rate with respect to the Class A-L1 Interest shall
be 6.120% per annum. The pass-through rate with respect to the Class A-L2
Interest shall be 5.000% per annum. The pass-through rate with respect to the
Class A-L3 Interest shall be 5.750% per annum. The pass-through rate with
respect to the Class A-L4 Interest shall be 5.750% per annum. The pass-through
rate with respect to the Class A-L18 Interest shall be 6.000% per annum. The
pass-through rate with respect to the Class A-LUR Interest, Class B-L1 Interest,
Class B-L2 Interest, Class B-L3 Interest, Class B-L4 Interest, Class B-L5
Interest and Class B-L6 Interest shall be 5.500% per annum. The Class A-L14
Interest and Class A-LPO Interest are principal-only interests and are not
entitled to distributions of interest. Any Non-Supported Interest Shortfalls
will be allocated to each Uncertificated Lower-Tier Interest in the same
relative proportions as interest is allocated to such Uncertificated Lower-Tier
Interest.

            (b) The Class A-12 Certificates are Interest Only Certificates and
are not entitled to distributions in respect of principal.

            I. On each Distribution Date occurring prior to the Accretion
Termination Date, the Accrual Distribution Amount will be distributed,
sequentially, as follows:

                  first, concurrently, to the Class A-3, Class A-5 and Class
A-11 Certificates, pro rata; and

                  second, to the Class A-6 Certificates.

            II. On each Distribution Date occurring prior to the Subordination
Depletion Date, the Class A Non-PO Principal Distribution Amount will be
allocated among and distributed in reduction of the Principal Balances of the
Class A Non-PO Certificates, sequentially, as follows:

      first, to the Class A-R Certificate; and

      second, concurrently, as follows:

            (a) 33.3333334211%, concurrently, to the Class A-2 and Class A-7
Certificates, pro rata; and

            (b) 66.6666665789%, concurrently, as follows:

            (i) 66.8477033140%, sequentially, as follows:

            (A) concurrently, to the Class A-4 and Class A-15 Certificates, pro
rata, up to the NAS I Priority Amount for such Distribution Date;

            (B) sequentially, to the Class A-9, Class A-10 and Class A-13
Certificates, up to the PAC Principal Amount for such Distribution Date;

             (C) concurrently, to the Class A-3, Class A-5 and Class A-11
Certificates, pro rata;

            (D) to the Class A-6 Certificates;

            (E) sequentially, to the Class A-9, Class A-10 and Class A-13
Certificates; and

            (F) concurrently, to the Class A-4 and Class A-15 Certificates, pro
rata; and

            (ii) 33.1522966860%, sequentially, as follows:

            (A) concurrently, to the Class A-8 and Class A-19 Certificates, pro
rata, up to the NAS II Priority Amount for such Distribution Date;

            (B) on each Distribution Date on or after January 2009, up to
$14,309 for such Distribution Date, concurrently, as follows:

            (1) 93.9542429419% to the Class A-1 Certificates; and

            (2) 6.0457570581% to the Class A-14 Certificates; and

            (C) sequentially, to the Class A-16 and Class A-17 Certificates;

            (D) concurrently, until the Principal Balance of the Class A-18
Certificates has been reduced to zero, as follows:

            (1) 95.8333297396% to the Class A-18 Certificates; and

            (2) 4.1666702604% to the Class A-14 Certificates;

            (E) concurrently, as follows:

            (1) 93.9542429419% to the Class A-1 Certificates; and

            (2) 6.0457570581% to the Class A-14 Certificates; and

            (F) concurrently, to the Class A-8 and Class A-19 Certificates, pro
rata.

            As used above, the "PAC Principal Amount" for any Distribution Date
means the amount, if any, that would reduce the sum of the Principal Balances of
the Class A-9, Class A-10 and Class A-13 Certificates (the "PAC Group") to the
percentage of the initial aggregate Principal Balance of the PAC Group shown in
the table with respect to such Distribution Date.

<PAGE>

             The following table sets forth for each Distribution Date the
planned Principal Balances for the PAC Group, expressed as a percentage of the
initial aggregate Principal Balance of such PAC Group.

<TABLE>
<CAPTION>

                           Planned Principal Balances
              as Percentages of Initial Aggregate Principal Balance

                                    PAC Group

                                                                Percentage of                        Percentage of
                        Percentage of                               Initial                               Initial
                          Initial                                 Aggregate                             Aggregate
                         Aggregate                                 Principal                             Principal
Distribution Date     Principal Balance     Distribution Date        Balance         Distribution Date      Balance
-----------------------------------------------------------------------------------------------------------------
<S>                      <C>                <C>                    <C>               <C>                  <C>
January 25, 2006         99.65086258%       April 25, 2010         42.83438658%      July 25, 2014        2.81423223%
February 25, 2006        99.25813001        May 25, 2010           41.59664195       August 25, 2014      2.63854387
March25,   2006           98.82194651        June 25, 2010          40.36540550       September 25, 2014   2.46991419
April 25, 2006           98.34244607        July 25, 2010          39.14064416       October 25, 2014     2.30810079
May25,   2006             97.81978508        August 25, 2010        37.92232499       November 25, 2014    2.15286896
June 25, 2006            97.25414226        September 25, 2010     36.71041526       December 25, 2014    2.00399146
July 25, 2006            96.64571862        October 25, 2010       35.50488239       January 25, 2015     1.94759617
August 25, 2006          95.99473735        November 25, 2010      34.30569399       February 25, 2015    1.89276729
September 25, 2006       95.30144368        December 25, 2010      33.11281784       March 25, 2015       1.83946171
October 25, 2006         94.56610481        January 25, 2011       31.98418653       April 25, 2015       1.78763753
November 25, 2006        93.78900972        February 25, 2011      30.86172471       May 25, 2015         1.73725397
December 25, 2006        92.97046900        March 25, 2011         29.74540080       June 25, 2015        1.68827137
January 25, 2007         92.11081468        April 25, 2011         28.63518338       July 25, 2015        1.64065115
February 25, 2007        91.21040003        May 25, 2011           27.53104119       August 25, 2015      1.59435581
March 25, 2007           90.26959928        June 25, 2011          26.43294315        September 25, 2015   1.54934883
April 25, 2007           89.28880747        July 25, 2011          25.34085833       October 25, 2015     1.50559472
May 25, 2007             88.26844009        August 25, 2011        24.25475597       November 25, 2015    1.46260308
June 25, 2007            87.20893287        September 25, 2011     23.17460546       December 25, 2015    1.42081822
July25,   2007            86.11074146        October   25, 2011      22.10037638       January 25, 2016     1.38020667
August 25, 2007          84.97434110        November 25, 2011      21.03203843       February 25, 2016    1.34073588
September 25, 2007       83.80022632        December 25, 2011      19.96956149       March 25, 2016       1.30237421
October 25, 2007         82.58891053        January 25, 2012       18.93967683       April 25, 2016       1.26509087
November 25, 2007        81.34092577        February 2012          17.94354028       May 25, 2016         1.22885592
December 25, 2007        80.05682216        March 25, 2012         16.98017069       June 25, 2016         1.19364027
January 25, 2008         78.73716769        April 25, 2012         16.04861421       July 25, 2016        1.15941560
February 25, 2008        77.38254764        May 25, 2012           15.14794356       August 25, 2016      1.12615438
March 25, 2008            75.99356426        June 25, 2012          14.27725724       September 25, 2016   1.09382983
April 25, 2008           74.58184063        July 25, 2012          13.43567892       October 25, 2016     1.06241592
May 25, 2008             73.17751091        August 25, 2012        12.62235667       November 25, 2016    1.03188734
June 25, 2008            71.78053741        September 25, 2012     11.83646232       December 25, 2016    1.00221945
July 25, 2008            70.39088262        October 25, 2012       11.07719082        January 25, 2017     0.97338831
August 25, 2008          69.00850926        November 25, 2012      10.34375962       February 25, 2017    0.94537064
September 25, 2008       67.63338023        December 25, 2012      9.63540800        March 25, 2017       0.91814379
October 25, 2008         66.26545861        January 25, 2013       9.08976111        April 25, 2017       0.89168575
November 25, 2008        64.90470769        February 25, 2013      8.56386542        May 25, 2017         0.86597510
December 25, 2008        63.55109093        March 25, 2013         8.05710274        June 25, 2017        0.84099102
January 25, 2009         62.20457200        April 25, 2013         7.56887293        July 25, 2017        0.81671325
February 25, 2009        60.86511475        May 2013 25,           7.09859342        August 25, 2017      0.79312212
March 25, 2009           59.53268321        June 25, 2013          6.64569873        September 25, 2017   0.77019848
April 25, 2009           58.20724162        July 25, 2013          6.20963998        October 25, 2017     0.74793740
May 25, 2009             56.88875437        August 25, 2013        5.78988438        November 25, 2017    0.72631973
June 25, 2009            55.57718608        September 25, 2013     5.38591485        December 25, 2017    0.70524883
July 25, 2009             54.27250151        October 25, 2013       4.99722954        January 25, 2018     0.68481401
August 25, 2009          52.97466564        November 25, 2013      4.62334135        February 25, 2018    0.66495859
September 25, 2009       51.68364358        December 2013          4.26377758        March 25, 2018       0.64566637
October25,   2009         50.39940070        January 25, 2014       4.03119569        April 25, 2018       0.62692162
November 25, 2009        49.12190248        February 25, 2014      3.80760486         May 25, 2018         0.60870905
December 25, 2009        47.85111461        March 25, 2014         3.59270192        June 25, 2018        0.59101375
January 25, 2010         46.58700296        April 25, 2014         3.38619320        July 25, 2018        0.57382127
February 25, 2010        45.32953356        May 25, 2014           3.18779424        August 25, 2018      0.55711754
March 25, 2010           44.07867263        June 25, 2014          2.99722954        September 25, 2018   0.54088887
October 25, 2018         0.52512197         January 25, 2024       0.07559125        April 25, 2029       0.00805979
November 25, 2018        0.50980391         February 25, 2024      0.07318845        May 25, 2029         0.00773265
December 25, 2018        0.49492211         March 25, 2024         0.07085764        June 25, 2029        0.00741624
January 25, 2019         0.48046433         April 25, 2024         0.06859674        July 25, 2029        0.00711024
February 25, 2019        0.46641870         May 25, 2024           0.06640372        August 25, 2029      0.00681432
March 25, 2019           0.45277365         June 25, 2024          0.06427661        September 25, 2029   0.00652817
April 25, 2019           0.43951795         July 25, 2024          0.06221349        October 25, 2029     0.00625151
May 25, 2019              0.42664067         August 25, 2024        0.06021249        November 25, 2029    0.00598402
June 25, 2019            0.41413118         September 25, 2024     0.05827181        December 25, 2029    0.00572544
July 25, 2019            0.40197916         October 25, 2024       0.05638969        January 25, 2030     0.00547547
August 25, 2019          0.39017457         November 25, 2024      0.05456443        February 25, 2030    0.00523386
September 25, 2019       0.37870763         December 25, 2024      0.05279435         March 25, 2030       0.00500034
October 25, 2019         0.36756885         January 25, 2025       0.05107786        April 25, 2030       0.00477468
November 25, 2019        0.35674901         February 25, 2025      0.04941337        May 25, 2030         0.00455661
December 25, 2019        0.34623914         March 25, 2025         0.04779939        June 25, 2030        0.00434591
January 25, 2020         0.33603051         April 25, 2025         0.04623441        July 25, 2030        0.00414234
February 25, 2020        0.32611463         May 25, 2025           0.04471701        August 25, 2030      0.00394568
March 25, 2020           0.31648327         June 25, 2025          0.04324580        September 25, 2030   0.00375571
April 25, 2020           0.30712839         July 25, 2025          0.04181943        October 25, 2030     0.00357223
May 25, 2020             0.29804222         August 25, 2025        0.04043656        November 25, 2030    0.00339503
June 25, 2020            0.28921717         September 25, 2025     0.03909593        December 25, 2030    0.00322392
July 25, 2020            0.28064589         October 25, 2025       0.03779630        January 25, 2031     0.00305869
August 25, 2020          0.27232119         November 25, 2025      0.03653645        February 25, 2031    0.00289918
September 25, 2020       0.26423614         December 25, 2025      0.03531523        March 25, 2031       0.00274519
October 25, 2020         0.25638395         January 25, 2026       0.03413148        April 25, 2031       0.00259656
November 25, 2020        0.24866855