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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: BEAR STEARNS ASSET BACKED SECURITIES TRUST 2007-SD2 | EMC MORTGAGE CORPORATION, | WELLS FARGO BANK, N.A., | CITIBANK, N.A., You are currently viewing:
This Pooling and Servicing Agreement involves

BEAR STEARNS ASSET BACKED SECURITIES TRUST 2007-SD2 | EMC MORTGAGE CORPORATION, | WELLS FARGO BANK, N.A., | CITIBANK, N.A.,

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: New York     Date: 4/3/2007

POOLING AND SERVICING AGREEMENT, Parties: bear stearns asset backed securities trust 2007-sd2 , emc mortgage corporation  , wells fargo bank  n.a.  , citibank  n.a.
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                                                                  Execution Copy



                   BEAR STEARNS ASSET BACKED SECURITIES I LLC,

                                    Depositor

                            EMC MORTGAGE CORPORATION,

                                      Sponsor

                             WELLS FARGO BANK, N.A.,

                  Master Servicer and Securities Administrator

                                       and

                                 CITIBANK, N.A.,

                                      Trustee


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

                         POOLING AND SERVICING AGREEMENT

                          Dated as of February 1, 2007
                     --------------------------------------


               BEAR STEARNS ASSET BACKED SECURITIES TRUST 2007-SD2

                   ASSET-BACKED CERTIFICATES, SERIES 2007-SD2


<PAGE>

                                TABLE OF CONTENTS

                                                                             Page

                                    ARTICLE I.

                                   DEFINITIONS

Section 1.01.       Defined Terms...............................................2

                                   ARTICLE II.

                            CONVEYANCE OF TRUST FUND
                         REPRESENTATIONS AND WARRANTIES

Section 2.01.       Conveyance of Trust Fund...................................47
Section 2.02.       Acceptance of the Mortgage Loans...........................49
Section 2.03.       Representations, Warranties and Covenants of the Master
                   Servicer and the Sponsor...................................51
Section 2.04.       Representations and Warranties of the Depositor............59
Section 2.05.       Delivery of Opinion of Counsel in Connection with
                   Substitutions and Repurchases..............................60
Section 2.06.       Authentication and Delivery of Certificates................60
Section 2.07.        Covenants of the Master Servicer...........................61
Section 2.08.       Lost Mortgage Notes Indemnity..............................61
Section 2.09.       Purposes and Powers of the Trust...........................61

                                   ARTICLE III.

              ADMINISTRATION AND MASTER SERVICING OF MORTGAGE LOANS

Section 3.01.       The Master Servicer........................................63
Section 3.02.       REMIC-Related Covenants....................................63
Section 3.03.       Monitoring of Servicers....................................64
Section 3.04.       [Reserved].................................................65
Section 3.05.       Power to Act; Procedures...................................65
Section 3.06.       Due-on-Sale Clauses; Assumption Agreements.................66
Section 3.07.       Release of Mortgage Files..................................66
Section 3.08.       Documents, Records and Funds in Possession of the
                   Master Servicer To Be Held for Trustee.....................67
Section 3.09.       Maintenance of Hazard Insurance............................67
Section 3.10.       Presentment of Claims and Collection of Proceeds...........68
Section 3.11.       Maintenance of the Primary Mortgage Insurance Policies.....68
Section 3.12.       Custodian to Retain Possession of Certain Insurance
                   Policies and Documents.....................................68
Section 3.13.       Realization Upon Defaulted Mortgage Loans..................69
Section 3.14.       Compensation for the Servicers and the Master Servicer.....69
Section 3.15.       REO Property...............................................69
Section 3.16.       Annual Statement as to Compliance..........................70
Section 3.17.       Assessments of Compliance and Attestation Reports..........70
Section 3.18.       Reports Filed with Securities and Exchange Commission......72


                                        i
<PAGE>


Section 3.19.       [Reserved].................................................81
Section 3.20.       Optional Purchase of Defaulted Mortgage Loans..............81
Section 3.21.       [Reserved].................................................81
Section 3.22.       Intention of the Parties and Interpretation................81

                                   ARTICLE IV.

                                    ACCOUNTS

Section 4.01.       Protected Accounts.........................................82
Section 4.02.       [Reserved].................................................82
Section 4.03.       [Reserved].................................................82
Section 4.04.       Distribution Account.......................................82
Section 4.05.       Permitted Withdrawals and Transfers from the
                    Distribution Account.......................................84
Section 4.06.       The Yield Maintenance Account and the Yield Maintenance
                   Agreements.................................................86
Section 4.07.       The Final Maturity Reserve Account.........................87
Section 4.08.       Class P Reserve Account....................................88

                                   ARTICLE V.

                           DISTRIBUTIONS AND ADVANCES
                              BY THE MASTER SERVICER

Section 5.01.       Advances...................................................90
Section 5.02.       Compensating Interest Payments.............................90
Section 5.03.       REMIC Distributions........................................91
Section 5.04.       Distributions..............................................91
Section 5.04A.      Allocation of Realized Losses..............................98
Section 5.05.       Monthly Statements to Certificateholders..................100
Section 5.06.       REMIC Designations and Allocations........................103
Section 5.07.       Basis Risk Reserve Fund...................................108

                                   ARTICLE VI.

                                THE CERTIFICATES

Section 6.01.       The Certificates..........................................109
Section 6.02.       Certificate Register; Registration of Transfer and
                   Exchange of Certificates..................................111
Section 6.03.       Mutilated, Destroyed, Lost or Stolen Certificates.........115
Section 6.04.       Persons Deemed Owners.....................................115
Section 6.05.       Access to List of Certificateholders' Names and
                   Addresses.................................................115
Section 6.06.       Book-Entry Certificates...................................115
Section 6.07.       Notices to Depository.....................................116
Section 6.08.       Definitive Certificates...................................116
Section 6.09.       Maintenance of Office or Agency...........................117
Section 6.10.       Appointment of Paying Agent and Certificate Registrar.....117


                                       ii
<PAGE>


                                   ARTICLE VII.

               THE DEPOSITOR, THE MASTER SERVICER AND THE SPONSOR

Section 7.01.       Respective Liabilities of the Depositor, the Master
                   Servicer and the Sponsor..................................118
Section 7.02.       Merger or Consolidation of the Depositor, the Master
                   Servicer or the Sponsor...................................118
Section 7.03.       Indemnification of the Trustee, the Master Servicer,
                   the Securities Administrator and Others...................118
Section 7.04.       Limitation on Liability of the Depositor, the Sponsor,
                   the Master Servicer, the Securities Administrator and
                   Others....................................................119
Section 7.05.       Limitation on Resignation of Master Servicer and Sponsor..120
Section 7.06.       Errors and Omissions Insurance; Fidelity Bonds............120

                                  ARTICLE VIII.

                     DEFAULT; TERMINATION OF MASTER SERVICER

Section 8.01.       Events of Default.........................................121
Section 8.02.       Trustee to Act; Appointment of Successor..................122
Section 8.03.       Notification to Certificateholders........................123

                                   ARTICLE IX.

             CONCERNING THE TRUSTEE AND THE SECURITIES ADMINISTRATOR

Section 9.01.       Duties of Trustee and Securities Administrator............124
Section 9.02.       Certain Matters Affecting the Trustee and the
                   Securities Administrator..................................125
Section 9.03.       Trustee and Securities Administrator Not Liable for
                   Certificates or Mortgage Loans............................127
Section 9.04.       Trustee and Securities Administrator May Own
                   Certificates..............................................128
Section 9.05.       Trustee's and Securities Administrator's Fees and
                   Expenses..................................................128
Section 9.06.       Eligibility Requirements for Trustee, Securities
                   Administrator and Paying Agent............................128
Section 9.07.       Insurance.................................................129
Section 9.08.       Resignation and Removal of Trustee, Securities
                   Administrator and Paying Agent............................129
Section 9.09.       Successor Trustee, Securities Administrator or Successor
                    Paying Agent..............................................130
Section 9.10.       Merger or Consolidation of Trustee, Securities
                   Administrator or Paying Agent.............................131
Section 9.11.       Appointment of Co-Trustee or Separate Trustee.............131
Section 9.12.       Tax Matters...............................................132

                                   ARTICLE X.

                                  TERMINATION

Section 10.01.      Termination upon Liquidation or Repurchase of the
                   Mortgage Loans............................................135
Section 10.02.      Final Distribution on the Certificates....................135
Section 10.03.      Additional Termination Requirements.......................136

                                   ARTICLE XI.

                            MISCELLANEOUS PROVISIONS

Section 11.01.      Amendment.................................................138


                                       iii
<PAGE>


Section 11.02.      Recordation of Agreement; Counterparts....................139
Section 11.03.      Governing Law.............................................139
Section 11.04.      Intention of Parties......................................139
Section 11.05.      Notices...................................................140
Section 11.06.      Severability of Provisions................................141
Section 11.07.      Assignment................................................141
Section 11.08.      Limitation on Rights of Certificateholders................141
Section 11.09.      Inspection and Audit Rights...............................142
Section 11.10.      Certificates Nonassessable and Fully Paid.................142



                                        iv

<PAGE>


Exhibits
--------

Exhibit A-1        Form of Class A Certificates
Exhibit A-2        Form of Class I-B and Class II-M Certificates
Exhibit A-3        Form of Class I-PO Certificates
Exhibit A-4        Form of Class P Certificates
Exhibit A-5        Form of Class X Certificates
Exhibit A-6        Form of Class B-IO Certificates
Exhibit A-7        Form of Class R Certificates
Exhibit B          Mortgage Loan Schedule
Exhibit C          [Reserved]
Exhibit D          Form of Transfer Affidavit
Exhibit E          Form of Transferor Certificate
Exhibit F          Form of Investment Letter (Non-Rule 144A)
Exhibit G          Form of Rule 144A Investment Letter
Exhibit H          Form of Request for Release
Exhibit I          DTC Letter of Representations
Exhibit J          Schedule of Mortgage Loans with Lost Notes
Exhibit K          Form of Custodial Agreements
Exhibit L          Servicing Criteria to be Addressed in Assessment of Compliance
Exhibit M-1        Form of Back-Up Certification
Exhibit M-2         Form of Certification for   the Securities Administrator
Exhibit N          Form of Yield Maintenance Agreements
Exhibit O          Form 10-D, Form 8-K and Form 10-K Reporting Responsibilities
Exhibit P          Form of Additional Disclosure Notice


Schedules
Schedule I          Servicing Agreements
Schedule II         Assignment, Assumptions and Recognition Agreements
Schedule III        Yield Maintenance Agreements Projected Principal Balances
Schedule IV         Coupon Strip Reserve Account Schedule


                                         v




<PAGE>


                  POOLING AND SERVICING AGREEMENT, dated as of February 1, 2007,
among BEAR STEARNS ASSET BACKED SECURITIES I LLC, a Delaware limited liability
company, as depositor (the "Depositor"), EMC MORTGAGE CORPORATION, a Delaware
corporation, as sponsor (the "Sponsor"), WELLS FARGO BANK, N.A., a national
banking association, as master servicer (in such capacity, the "Master
Servicer") and as securities administrator (in such capacity, the "Securities
Administrator") and CITIBANK, N.A., a national banking association, as trustee
(the "Trustee").

                              PRELIMINARY STATEMENT

                  The parties to this Agreement hereby create a common law trust
pursuant to the laws of the State of New York. The Depositor is the owner of the
Trust Fund that is hereby conveyed to the Trustee in return for the
Certificates. As provided herein, the Securities Administrator on behalf of the
Trustee shall make four separate real estate mortgage investment conduit (each a
"REMIC") elections with respect to the Trust Fund for Federal income tax
purposes.

                  The Trust Fund shall be named, and may be referred to as, the
"Bear Stearns Asset Backed Securities Trust 2007-SD2." The Certificates issued
hereunder may be referred to as "Asset-Backed Certificates Series 2007-SD2"
(including for purposes of any endorsement or assignment of a Mortgage Note or
Mortgage).

                  In consideration of the mutual agreements herein contained,
the Depositor, the Master Servicer, the Securities Administrator, the Sponsor
and the Trustee agree as follows:




                                       1
<PAGE>

                                   ARTICLE I.

                                  DEFINITIONS

         Section 1.01. Defined Terms.

                  In addition to those terms defined in Section 1.02, whenever
used in this Agreement, the following words and phrases, unless the context
otherwise requires, shall have the following meanings:

                  Accepted Master Servicing Practices: With respect to any
Mortgage Loan those customary mortgage servicing practices of prudent mortgage
servicing institutions that master service mortgage loans of the same type and
quality as such Mortgage Loan in the jurisdiction where the related Mortgaged
Property is located, to the extent applicable to the Master Servicer (except in
its capacity as successor to a Servicer) or to the Trustee (in its capacity, if
at all, as Successor Master Servicer).

                  Account: Each Protected Account, the Distribution Account, the
Final Maturity Reserve Account, the Basis Risk Reserve Fund, the Yield
Maintenance Account and the Class P Reserve Account.

                  Accrual Period: With respect to the Certificates (other than
the Class I-PO Certificates, the Adjustable Rate Certificates, the Class P
Certificates and the Residual Certificates) will be the calendar month
immediately preceding the calendar month in which a Distribution Date occurs.
All calculations of interest on such Certificates will be made on the basis of a
360-day year that consists of twelve 30-day months.

                  With respect to the Adjustable Rate Certificates and any
Distribution Date, the period from and including the preceding Distribution Date
(or, in the case of the first Distribution Date, from the Closing Date) to and
including the day prior to the current Distribution Date. All calculations of
interest on the Adjustable Rate Certificates (including the Interest Rate Cap)
will be made on the basis of the actual number of days elapsed in the related
Accrual Period and in a 360-day year.

                  Accrued Certificate Interest: With respect to the Group I
Certificates of any Class (other than the Class I-PO Certificates) on any
Distribution Date, is equal to the amount of interest accrued during the related
Accrual Period at the applicable Pass-Through Rate on the Certificate Principal
Balance or Notional Amount, as applicable, of such Certificate immediately prior
to such Distribution Date, less (1) in the case of a Group I Senior Certificate,
such Certificate's share of (a) Prepayment Interest Shortfalls on the related
Mortgage Loans, to the extent not covered by Compensating Interest paid by the
Servicer or the Master Servicer, (b) interest shortfalls on the related Mortgage
Loans resulting from the application of the Relief Act or similar state law and
(c) after the Cross-Over Date, the interest portion of any Realized Losses on
the related Mortgage Loans, and (2) in the case of a Group I Subordinate
Certificate, such Certificate's share of (a) Prepayment Interest Shortfalls on
the related Mortgage Loans, to the extent not covered by Compensating Interest
paid by the Servicer or the Master Servicer, (b) interest shortfalls on the
related Mortgage Loans resulting from the application of the Relief Act or
similar state law and (c) the interest portion of any Realized Losses on the
related Mortgage Loans. The Senior Percentage of Prepayment Interest Shortfalls
and interest shortfalls resulting from the application of the Relief Act will be
allocated among the Group I Senior Certificates in the related Certificate Group
in proportion to the amount of Accrued Certificate Interest that would have been
allocated thereto in the absence of such shortfalls. The applicable Subordinate
Percentage of Prepayment Interest Shortfalls and interest shortfalls resulting
from the application of the Relief Act will be allocated among the Group I
Subordinate Certificates in proportion to the amount of Accrued Certificate
Interest that would have been allocated thereto in the absence of such
shortfalls. Accrued Certificate Interest with respect to the Group I
Certificates (other than the Class I-PO Certificates) is calculated on the basis
of a 360-day year consisting



                                       2
<PAGE>

of twelve 30-day months. No Accrued Certificate Interest will be payable with
respect to any Class of Certificates after the Distribution Date on which the
outstanding Certificate Principal Balance or Notional Amount, as applicable, of
such Certificate has been reduced to zero.

                  Actual Monthly Payments: For any Mortgage Loan in Loan Group
II and each Due Period, means the actual monthly payments of principal and
interest received during such month on such Mortgage Loan.

                  Additional Disclosure:   As defined in Section 3.18 (a).

                  Additional Form 10-D Disclosure:   As defined in Section
3.18 (a).

                  Additional Form 10-K Disclosure:   As defined in Section
3.18 (a).

                  Adjustable Rate Certificates:   The Class II-A Certificates and
the Class II-M Certificates.

                  Adjusted Rate Cap: With respect to each Class of Class II-A
Certificates and Class II-M Certificates, each Distribution Date and the related
Due Period, (A) the sum of (i) the scheduled Monthly Payments owed on the
related Mortgage Loans for such Due Period less the related Servicing Fees and
the related Master Servicing Fee and (ii) the Actual Monthly Payments received
in excess of such scheduled Monthly Payments, minus (B) the Coupon Strip, if
any, payable to the Final Maturity Reserve Account with respect to such
Distribution Date, expressed as a per annum rate calculated on the basis of the
aggregate Stated Principal Balance of the related Mortgage Loans for such Due
Period and further reflecting the accrual of interest on an actual/360 basis.

                  Advance: An advance of delinquent payments of principal (other
than in respect of delinquent payments of principal on any Simple Interest
Loans) or interest in respect of a Mortgage Loan required to be made by the
applicable Servicer pursuant to the related Servicing Agreement, or by the
Master Servicer pursuant to Section 5.01.

                  Agreement: This Pooling and Servicing Agreement and any and
all amendments or supplements hereto made in accordance with the terms herein.

                  Aggregate Subordinate Optimal Principal Amount: With respect
to Loan Group I, is the sum of each of the components of the definition of
Subordinate Optimal Principal Amount for all Sub-Loan Groups in such Loan Group.

                  Allocable Share: With respect to any class of Class I-B
Certificates on any Distribution Date, will equal such Class's pro rata share
(based on the Certificate Principal Balance of each Class entitled thereto) of
the Aggregate Subordinate Optimal Principal Amount; provided, however, that no
class of Class I-B Certificates (other than the class of Class I-B Certificates
with the lowest numerical designation) shall be entitled on any Distribution
Date to receive distributions pursuant to clauses (2), (3) and (5) of the
definition of Subordinate Optimal Principal Amount unless the Class Prepayment
Distribution Trigger for the related Class is satisfied for such Distribution
Date. Notwithstanding the foregoing, if on any Distribution Date the Certificate
Principal Balance of any class of Class I-B Certificates for which the related
Class Prepayment Distribution Trigger was satisfied on such Distribution Date is
reduced to zero, any amounts distributable to such Class pursuant to clauses
(2), (3) and (5) of the definition of Subordinate Optimal Principal Amount to
the extent of such Class's remaining Allocable Share, shall be distributed to
the remaining Classes of Class I-B Certificates in reduction of their respective
Certificate Principal Balances, sequentially, to the Class I-B Certificates, in
the order of their numerical class designations.



                                       3
<PAGE>


                  Amount Held for Future Distribution: As to any Distribution
Date, the aggregate amount held in the Distribution Account at the close of
business on the immediately preceding Determination Date on account of (i) all
Scheduled Payments or portions thereof received in respect of the Mortgage Loans
due after the related Due Period and (ii) Principal Prepayments, Liquidation
Proceeds, Insurance Proceeds and Subsequent Recoveries received in respect of
such Mortgage Loans after the last day of the related Prepayment Period or
Liquidation Period, as applicable.

                  Annual Statement of Compliance:   As defined in Section 3.16.

                  Applicable Written Notice: For purposes of Section 8.01,
written notice to the Master Servicer by the Trustee, the Securities
Administrator or the Depositor, or to the Trustee and the Master Servicer by the
Holders of Certificates evidencing not less than 25% of the Voting Rights
evidenced by the Certificates.

                  Applied Realized Loss Amount: With respect to any Distribution
Date and each Class of Group II Offered Certificates, the sum of the Realized
Losses with respect to the Mortgage Loans in Loan Group II, which have been
allocated in reduction of the Certificate Principal Balance of such Class of
Certificates pursuant to this Agreement. Realized Losses in respect of Loan
Group II in the aggregate shall equal the amount, if any, by which (i) the
aggregate Certificate Principal Balance of all of the Group II Certificates
(after all distributions of principal on such Distribution Date) exceeds (ii)
the aggregate Stated Principal Balance of all of the Mortgage Loans in Loan
Group II for such Distribution Date. Realized Losses in respect of Loan Group I
shall be allocated, first, the Class II-M-5 Certificates, the Class II-M-4
Certificates, the Class II-M-3 Certificates, the Class II-M-2 Certificates and
the Class II-M-1 Certificates, in that order, in each case until the respective
Certificate Principal Balance thereof has been reduced to zero, and then, to the
Class II-A-2 Certificates and the Class II-A-1 Certificates, in that order, in
each case until the Certificate Principal Balance of each such class has been
reduced to zero.

                  Appraised Value: With respect to any Mortgage Loan originated
in connection with a refinancing, the appraised value of the Mortgaged Property
based upon the appraisal made at the time of such refinancing or, with respect
to any other Mortgage Loan, the appraised value of the Mortgaged Property based
upon the appraisal made by a fee appraiser at the time of the origination of the
related Mortgage Loan.

                  Assessment of Compliance:   As defined in Section 3.17.

                   Assumption Agreement: Any Assignment, Assumption and
Recognition Agreement or comparable document transferring or acknowledging the
transfer of a Servicing Agreement to the Trust set forth on Schedule II hereto.

                  Attesting Party:   As defined in Section 3.17.

                  Attestation Report:   As defined in Section 3.17.

                  Available Funds: With respect to any Distribution Date and
each Sub-Loan Group in Loan Group I, an amount equal to the aggregate of the
following amounts with respect to the Mortgage Loans in the related Sub-Loan
Group: (a) all previously undistributed payments on account of principal
(including the principal portion of Scheduled Payments, Principal Prepayments
and the principal portion of Net Liquidation Proceeds) and all previously
undistributed payments on account of interest received after the Cut-off Date
and on or prior to the related Determination Date, (b) any Advances and
Compensating Interest paid by the paid by the Servicer or the Master Servicer
with respect to such Distribution Date, (c) any reimbursed amount in connection
with losses on investments of deposits in


                                       4
<PAGE>


certain eligible investments in respect of the Mortgage Loans in the related
Sub-Loan Group, and (d) any amount allocated from the Available Funds of another
Sub-Loan Group in accordance with Section 5.04(a)(I)(i)(F), except:

                  (i) all payments that were due on or before the Cut-off Date;

                   (ii) all Principal Prepayments and Liquidation Proceeds
received after the applicable Prepayment Period and the Liquidation Period,
respectively;

                  (iii) all payments, other than Principal Prepayments, that
represent early receipt of Scheduled Payments due on a date or dates subsequent
to the related Due Date;

                  (iv) amounts received on particular Mortgage Loans as late
payments of principal or interest and respecting which, and to the extent that,
there are any unreimbursed Advances;

                  (v) amounts of Advances determined to be Nonrecoverable
Advances;

                  (vi) any investment earnings on amounts on deposit in the
Distribution Account and amounts permitted to be withdrawn from the Distribution
Account pursuant to this Agreement;

                  (vii) amounts needed to pay the Servicing Fees, the Master
Servicing Fee or to reimburse the Servicer or the Master Servicer for amounts
due under the Servicing Agreement and this Agreement (allocated as provided in
Section 4.05(b)) to the extent such amounts have not been retained by, or paid
previously to, the Servicer or the Master Servicer;

                  (viii) amounts applied to pay any fees with respect to any
lender-paid primary mortgage insurance policy (allocated as provided in Section
4.05(b)); and

                  (ix) any expenses or other amounts (allocated as provided in
Section 4.05(b)) reimbursable to the Trustee, the Securities Administrator and
the Custodian pursuant to Section 4.05(a), Section 7.04 or Section 9.05.

                  Back-Up Certification:   As defined in Section 3.18(a)(iii).

                  Balloon Loan: A Mortgage Loan, identified as such on the
Mortgage Loan Schedule, where the related Mortgage Note provides for lowered
payments of principal over the life of such Mortgage Loan and a larger payment
of principal than is usual at its stated maturity.

                  Bankruptcy Code:   Title 11 of the United States Code.

                  Basis Risk Reserve Fund:   The fund maintained as described in
Section 5.07.

                  Basis Risk Shortfall: As of any Distribution Date and for any
Class of Adjustable Rate Certificates, the excess of (i) the amount of Current
Interest that such Class would have been entitled to receive on such
Distribution Date had the applicable Pass-Through Rate been calculated without
regard to the Interest Rate Cap; over (ii) the sum of interest for such Class,
calculated at the applicable Interest Rate Cap for such Distribution Date, and
any amount paid to such Class in respect of interest under the Yield Maintenance
Agreement.

                  Basis Risk Shortfall Carry Forward Amount: As of any
Distribution Date and for any Class of Adjustable Rate Certificates, the sum of:
(i) if on such Distribution Date the applicable Pass-



                                       5
<PAGE>


Through Rate for such Class is based upon the applicable Interest Rate Cap, the
applicable Basis Risk Shortfall; and (ii) the Basis Risk Shortfall for all
previous Distribution Dates not previously paid (including interest accrued
thereon at the applicable Pass-Through Rate for the Accrual Period with respect
to each such prior Distribution Date), together with interest thereon at a rate
equal to the applicable Pass-Through Rate for such Distribution Date.

                  Book-Entry Certificates: Any of the Certificates that shall be
registered in the name of the Depository or its nominee, the ownership of which
is reflected on the books of the Depository or on the books of a person
maintaining an account with the Depository (directly, as a "Depository
Participant", or indirectly, as an indirect participant in accordance with the
rules of the Depository and as described in Section 6.06). As of the Closing
Date, each Class of Regular Certificates constitutes a Class of Book-Entry
Certificates.

                  Business Day: Any day other than (i) a Saturday or a Sunday,
or (ii) a day on which banking institutions in The City of New York, New York,
or the States of Maryland, Minnesota or Texas, or, if different, the city in
which the Corporate Trust Office of the Trustee or the principal office of the
Securities Administrator, the Master Servicer or of a Servicer is located are
authorized or obligated by law or executive order to be closed.

                  Cede:   Cede & Co., or its successors in interest.

                  Certificate:   Any one of the certificates of any Class
executed and   authenticated   by the Certificate Registrar in substantially the
forms attached hereto as Exhibits A-1 through A-6.

                  Certificate Group: With respect to the Certificates, either
Sub-Loan Group I-1, Sub-Loan Group I-2 or Sub-Loan
Group I-3, as applicable.

                  Certificate Margin: Reference to any of the Class II-A-1
Margin, the Class II-A-2 Margin, the Class II-A-3 Margin, the Class II-M-1
Margin, the Class II-M-2 Margin, the Class II-M-3 Margin, the Class II-M-4
Margin or the Class II-M-5 Margin.

                  Certificate Owner: With respect to a Book-Entry Certificate,
the Person that is the beneficial owner of such Book-Entry Certificate.

                  Certificate Principal Balance: As to any Certificate (other
than any Class I-X Certificates, Class B-IO Certificates or Residual
Certificates) and as of any Distribution Date, the Initial Certificate Principal
Balance of such Certificate, increased by (i) (in the case of the Group II
Certificates) the amount of any Net Deferred Interest allocated thereto on such
Distribution Date and on any previous Distribution Dates, and (ii) any
Subsequent Recoveries allocated to such Class (other than an Interest-Only
Certificate) on previous Distribution Dates pursuant to Section 5.04A, reduced
by the sum of (i) all amounts distributed with respect to such Certificate in
reduction of the Certificate Principal Balance thereof on previous Distribution
Dates pursuant to Section 5.04, (ii) the principal portion of the Realized
Losses (other than Realized Losses resulting from Debt Service Reductions)
allocated to such Certificate on previous Distribution Dates, and (iii) solely
in the case of the Group I Subordinate Certificates, such Certificate's pro rata
share, if any, of the applicable Subordinate Certificate Writedown Amount for
previous Distribution Dates. References herein to the Certificate Principal
Balance of a Class of Certificates shall mean the Certificate Principal Balances
of all Certificates in such Class.

                  Certificate Register:   The register maintained pursuant to
Section 6.02 hereof.



                                       6
<PAGE>

                  Certificate Registrar:   The Securities Administrator or any
successor certificate registrar appointed hereunder.

                  Certificate   Registrar Office: The office of the Certificate  
Registrar located at Sixth Street and Marquette Avenue, Minneapolis, Minnesota
55479, Attention:   BSABS 2007-SD2.

                  Certificateholder   or Holder:   The person in whose name a  
Certificate   is   registered   in the   Certificate   Register (initially, Cede &
Co., as nominee for the Depository, in the case of any Book-Entry Certificates).

                  Certification Parties:   As defined in Section 3.18(a)(iii)(D).

                  Certifying Person:   As defined in Section 3.18(a)(iii)(D).

                  Class:   All Certificates bearing the same Class designation as
  set forth in Section 6.01 hereof.

                  Class A Certificates:   The Class I-A Certificates and the
Class II-A Certificates, in the form of Exhibit A-1 hereto.

                  Class B-IO Distribution Amount: With respect to any
Distribution Date, the amount allocable to the Class B-IO Certificates as
provided in Section 5.04 and Section 5.06(d), for such Distribution Date and all
prior Distribution Dates, less the aggregate of all amounts distributed (or
deemed distributed) in accordance with Section 5.04 and Section 5.06(d) with
respect to the Class B-IO Certificates on prior Distribution Dates.

                  Class P Certificate: The Class I-P Certificates and the Class
II-P Certificates, in the form of Exhibit A-4 hereto.

                  Class Prepayment Distribution Trigger: A test, which shall be
satisfied for a class of Group I Subordinate Certificates for a Distribution
Date if the fraction (expressed as a percentage), the numerator of which is the
aggregate Certificate Principal Balance of such Class and each Class of Group I
Subordinate Certificates subordinate thereto, if any, and the denominator of
which is the Stated Principal Balances of all of the Mortgage Loans in Loan
Group I as of the related Due Date, equals or exceeds such percentage calculated
as of the Closing Date.

                  Class P Reserve Account: The reserve account established and
maintained by the Securities Administrator pursuant to Section 4.08.

                  Class R-I Certificate: Any Certificate designated as a "Class
R-I Certificate" on the face thereof, in substantially the form set forth in
Exhibit A-6 hereto, and evidencing ownership of the residual interest in REMIC I
and representing the right to the Percentage Interest of distributions provided
for the Class R-1 Certificate as set forth herein.

                  Class R-II Certificate: Any Certificate designated as a "Class
R-II Certificate" on the face thereof, in substantially the form set forth in
Exhibit A-6 hereto, and evidencing ownership of the residual interest in REMIC
II and representing the right to the Percentage Interest of distributions
provided for the Class R-2 Certificate as set forth herein.

                  Class R-III Certificate: Any Certificate designated as a
"Class R-III Certificate" on the face thereof, in substantially the form set
forth in Exhibit A-6 hereto, and evidencing ownership of the


                                       7
<PAGE>

residual interest in REMIC III and representing the right to the Percentage
Interest of distributions provided for the Class R-III Certificate as set forth
herein.

                  Class R-X Certificate: Any Certificate designated as a "Class
R-X Certificate" on the face thereof, in substantially the form set forth in
Exhibit A-6 hereto, and evidencing ownership of the residual interest in REMIC
IV and representing the right to the Percentage Interest of distributions
provided for the Class R-X Certificate as set forth herein.

                  Class I-A Certificates: The Class I-A-1 Certificates, Class
I-A-2 Certificates and Class I-A-3 Certificates.

                  Class I-A-1 Certificates:   The Class I-A-1A Certificates and
Class I-A-1B Certificates.

                  Class I-A-2 Certificates:   The Class I-A-2A Certificates and
Class I-A-2B Certificates.

                  Class I-A-3 Certificates:   The Class I-A-3A Certificates and
Class I-A-3B Certificates.

                  Class I-B Certificates: The I-B-1 Certificates, Class I-B-2
Certificates, Class I-B-3 Certificates, Class I-B-4 Certificates, Class I-B-5
Certificates and Class I-B-6 Certificates.

                  Class I-P Certificate: Any Certificate designated as a "Class
I-P Certificate" on the face thereof, in the form of Exhibit A-4 hereto,
representing the right to its Percentage Interest of distributions provided for
the Class I-P Certificates as set forth herein.

                   Class I-PO Certificate: Any Certificate designated as a "Class
I-PO Certificate" on the face thereof, in the form of Exhibit A-3 hereto,
representing the right to its Percentage Interest of distributions provided for
the Class I-PO Certificates as set forth herein.

                  Class I-PO Certificate Cash Shortfall: For any Distribution
Date, the difference between (i) principal distributable to the Class I-PO
Certificates in accordance with priority third of clause (i)(A) under subsection
5.04(a)(I), and (ii) principal actually distributed to the Class I-PO
Certificates after giving effect to clause (iii) under subsection 5.04(a)(I).

                  Class I-PO Certificate Deferred Amount: As to each
Distribution Date through the Cross-Over Date, the aggregate of all amounts
allocable on such dates to the Class I-PO Certificates in respect of the
principal portion of Realized Losses in respect of Discount Mortgage Loans in
Sub-Loan Group I-1 and the Class I-PO Certificate Cash Shortfall and all amounts
previously allocated in respect of such losses and such shortfalls to the Class
I-PO Certificates, and not distributed on prior Distribution Dates.

                  Class I-PO Certificate   Principal   Distribution   Amount:   With
respect to each Distribution   Date, an amount equal to
the sum of:

                  (i) the PO Percentage of all scheduled payments of principal
         due on each Discount Mortgage Loan in Sub-Loan Group I-1 on the related
         Due Date as specified in the amortization schedule at the time
         applicable thereto (after adjustment for previous principal prepayments
         but before any adjustment to such amortization schedule by reason of
         any bankruptcy or similar proceeding or any moratorium or similar
         waiver or grace period);



                                       8
<PAGE>

                  (ii) the PO Percentage of the stated principal balance of each
         Discount Mortgage Loan in Sub-Loan Group I-1 which was the subject of a
          prepayment in full received by a Servicer during the applicable
         Prepayment Period;

                  (iii) the PO Percentage of all partial prepayments of
         principal of each Discount Mortgage Loan in Sub-Loan Group I-1 received
          during the applicable Prepayment Period;

                  (iv) the lesser of (a) the PO Percentage of the sum of (A) all
         net Liquidation Proceeds allocable to principal on each Discount
         Mortgage Loan in Sub-Loan Group I-1 which became a Liquidated Mortgage
         Loan during the related Liquidation Period (other than a Discount
         Mortgage Loan described in clause (B)) and (B) the stated principal
         balance of each such Discount Mortgage Loan in Sub-Loan Group I-1
          purchased by an insurer from the Trust during the related Prepayment
         Period pursuant to the related primary mortgage insurance policy, if
         any, or otherwise; and (b) the PO Percentage of the sum of (A) the
         stated principal balance of each Discount Mortgage Loan in Sub-Loan
         Group I-1 which became a Liquidated Mortgage Loan during the related
         Prepayment Period (other than a Discount Mortgage Loan described in
         clause (B)) and (B) the stated principal balance of each such Mortgage
         Loan in Sub-Loan Group I-1 that was purchased by an insurer from the
         Trust during the related Prepayment Period pursuant to the related
         primary mortgage insurance policy, if any, or otherwise; and

                   (v) the PO Percentage of the sum of (a) the Stated Principal
         Balance of each Discount Mortgage Loan in Sub-Loan Group I-1 which was
         repurchased by the seller in connection with such Distribution Date and
         (b) the difference, if any, between the Stated Principal Balance of a
         Discount Mortgage Loan in Sub-Loan Group I-1 that has been replaced by
         the seller with a substitute Discount Mortgage Loan pursuant to the
         pooling and servicing agreement in connection with such Distribution
         Date and the Stated Principal Balance of such substitute Discount
         Mortgage Loan.

The Class I-PO Certificates shall be entitled to distributions from Sub-Loan
Group I-1 only.

                  Class II-A Certificates:   The Class II-A-1 Certificates and
Class II-A-2 Certificates.

                  Class II-A Principal   Distribution   Amount: With respect to
any applicable   Distribution Date, an amount equal to the excess, if any, of:

                   1.        the aggregate Certificate Principal Balance of the
                           Class II-A Certificates immediately prior to such
                           Distribution Date over

                  2.        the lesser of

                            I.        the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                             Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                             reduction for Realized Losses
                                            incurred during the related

                                       9
<PAGE>


                                            Realized Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period)
                                            multiplied by (i) on each
                                             Distribution Date prior to the
                                            Distribution Date in February 2013,
                                            38.250% and (ii) on each
                                            Distribution Date on and after the
                                            Distribution Date in February 2013,
                                            30.600%, and

                           II.       the excess of

                                    (a)       the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                             Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                            Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                            Cut-off Date.

                  Class II-A-1 Certificate: Any Certificate designated as a
"Class II-A-1 Certificate" on the face thereof, in the form of Exhibit A-1
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-A-1 Certificates as set forth herein.

                  Class II-A-1 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 0.400% per annum and (ii) thereafter, 0.800%
per annum.

                  Class II-A-1 Pass-Through Rate: On any Distribution Date, the
least of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-A-1 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class II-A-2 Certificate: Any Certificate designated as a
"Class II-A-2 Certificate" on the face thereof, in the form of Exhibit A-1
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-A-2 Certificates as set forth herein.

                  Class II-A-2 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 0.500% per annum and (ii) thereafter, 1.000%
per annum.

                  Class II-A-2 Pass-Through Rate: On any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-A-2 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class B-IO Certificate: Any Certificate designated as a "Class
B-IO Certificate" on the face thereof, in the form of Exhibit A-6 hereto,
representing the right to its Percentage Interest of distributions provided for
the Class B-IO Certificates herein.

                  Class II-M Certificates: The M-1 Certificates, Class II-M-2
Certificates, Class II-M-3 Certificates, Class II-M-4 Certificates and Class
II-M-5 Certificates.

                  Class II-M-1 Certificate: Any Certificate designated as a
"Class II-M-1 Certificate" on the face thereof, in the form of Exhibit A-2
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-M-1 Certificates as set forth herein.



                                       10
<PAGE>

                  Class II-M-1 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 0.420% per annum and (ii) thereafter, 0.630%
per annum.

                  Class II-M-1 Pass-Through Rate: For any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-M-1 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class II-M-1 Principal Distribution Amount: With respect to
any applicable Distribution Date, an amount equal to the excess, if any, of:

                  1.        the Certificate Principal Balance of the Class II-M-1
                           Certificates immediately prior to such Distribution
                           Date over

                  2.        the lesser of

                           I.        the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                     (b)      the sum of

                                            (1)       the aggregate Certificate
                                                     Principal Balance of the
                                                     Class II-A Certificates
                                                     (after taking into account
                                                     the payment of the Class
                                                     II-A Principal Distribution
                                                      Amount on such Distribution
                                                     Date), and

                                            (2)       the aggregate Stated
                                                      Principal Balance of the
                                                     Mortgage Loans in Loan
                                                     Group II as of the last day
                                                     of the related Due Period
                                                     (after reduction for
                                                     Realized Losses incurred
                                                     during the related Realized
                                                      Loss Period and Principal
                                                     Prepayments received during
                                                     the related Prepayment
                                                      Period) multiplied by (i)
                                                     on each Distribution Date
                                                     prior to the Distribution
                                                     Date in February 2013,
                                                     32.375% and (ii) on each
                                                     Distribution Date on and
                                                     after the Distribution Date
                                                     in February 2013, 25.900%,
                                                     and

                           II.       the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                             reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                            Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                            Cut-off Date.



                                       11
<PAGE>

                  Class II-M-2 Certificate: Any Certificate designated as a
"Class II-M-2 Certificate" on the face thereof, in the form of Exhibit A-2
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-M-2 Certificates as set forth herein.

                  Class II-M-2 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 0.500% per annum and (ii) thereafter, 0.750%
per annum.

                  Class II-M-2 Pass-Through Rate: For any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-M-2 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class II-M-2 Principal Distribution Amount: With respect to
any applicable Distribution Date, an amount equal to the excess, if any, of:

                  1.        the Certificate Principal Balance of the Class II-M-2
                           Certificates immediately prior to such Distribution
                            Date over

                  2.        the lesser of

                           I.        the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                             incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      the sum of

                                            (1)       the aggregate Certificate
                                                     Principal Balance of the
                                                      Class II-A Certificates
                                                     (after taking into account
                                                     the payment of the Class
                                                      II-A Principal Distribution
                                                     Amount on such Distribution
                                                     Date),

                                            (2)       the Certificate Principal
                                                     Balance of the Class II-M-1
                                                     Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-1 Principal
                                                     Distribution Amount on such
                                                     Distribution Date), and

                                             (3)       the aggregate Stated
                                                     Principal Balance of the
                                                     Mortgage Loans in Loan
                                                      Group II as of the last day
                                                     of the related Due Period
                                                     (after reduction for
                                                     Realized Losses incurred
                                                     during the related Realized
                                                     Loss Period and Principal
                                                     Prepayments received during
                                                      the related Prepayment
                                                     Period) multiplied by (i)
                                                     on each Distribution Date
                                                      prior to the Distribution
                                                     Date in February 2013,
                                                     26.875% and (ii) on each
                                                      Distribution Date on and
                                                     after the Distribution Date
                                                     in February 2013, 21.500%,
                                                     and

                            II.       the excess of



                                       12
<PAGE>

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                             Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                             incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                            Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                             Cut-off Date.

                  Class II-M-3 Certificate: Any Certificate designated as a
"Class II-M-3 Certificate" on the face thereof, in the form of Exhibit A-2
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-M-3 Certificates as set forth herein.

                  Class II-M-3 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 0.800% per annum and (ii) thereafter, 1.200%
per annum.

                   Class II-M-3 Pass-Through Rate: For any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-M-3 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class II-M-3 Principal Distribution Amount: With respect to
any applicable Distribution Date, an amount equal to the excess, if any, of:

                  1.        the Certificate Principal Balance of the Class II-M-3
                           Certificates immediately prior to such Distribution
                           Date over

                  2.        the lesser of

                           I.        the excess of

                                     (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                             Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      the sum of

                                            (1)       the aggregate Certificate
                                                     Principal Balance of the
                                                     Class II-A Certificates
                                                     (after taking into account
                                                     the payment of the Class
                                                     II-A Principal Distribution
                                                     Amount on such Distribution
                                                      Date),

                                            (2)       the Certificate Principal
                                                     Balance of the Class II-M-1
                                                      Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-1 Principal
                                                     Distribution Amount on such
                                                     Distribution Date),

                                            (3)       the Certificate Principal
                                                     Balance of the Class II-M-2
                                                      Certificates (after taking
                                                     into account the payment of
                                                     the

                                       13
<PAGE>


                                                     Class II-M-2 Principal
                                                     Distribution Amount on such
                                                     Distribution Date), and

                                             (4)       the aggregate Stated
                                                     Principal Balance of the
                                                     Mortgage Loans in Loan
                                                      Group II as of the last day
                                                     of the related Due Period
                                                     (after reduction for
                                                     Realized Losses incurred
                                                     during the related Realized
                                                     Loss Period and Principal
                                                     Prepayments received during
                                                      the related Prepayment
                                                     Period) multiplied by (i)
                                                     on each Distribution Date
                                                      prior to the Distribution
                                                     Date in February 2013,
                                                     17.750% and (ii) on each
                                                      Distribution Date on and
                                                     after the Distribution Date
                                                     in February 2013, 14.200%,
                                                     and

                            II.       the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                             Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                            Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                            Cut-off Date.

                   Class II-M-4 Certificate: Any Certificate designated as a
"Class II-M-4 Certificate" on the face thereof, in the form of Exhibit A-2
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-M-4 Certificates as set forth herein.

                  Class II-M-4 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 1.000% per annum and (ii) thereafter, 1.500%
per annum.

                  Class II-M-4 Pass-Through Rate: For any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-M-4 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                   Class II-M-4 Principal Distribution Amount: With respect to
any applicable Distribution Date, an amount equal to the excess, if any, of:

                  1.        the Certificate Principal Balance of the Class II-M-4
                           Certificates immediately prior to such Distribution
                           Date over

                  2.        the lesser of

                           I.        the excess of

                                    (a)      the aggregate Stated Principal
                                             Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                             reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over



                                       14
<PAGE>

                                    (b)      the sum of

                                            (1)       the aggregate Certificate
                                                     Principal Balance of the
                                                     Class II-A Certificates
                                                     (after taking into account
                                                     the payment of the Class
                                                     II-A Principal Distribution
                                                     Amount on such Distribution
                                                      Date),

                                            (2)       the Certificate Principal
                                                     Balance of the Class II-M-1
                                                      Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-1 Principal
                                                     Distribution Amount on such
                                                     Distribution Date),
                                            (3)       the Certificate Principal
                                                     Balance of the Class II-M-2
                                                      Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-2 Principal
                                                      Distribution Amount on such
                                                     Distribution Date),

                                            (4)       the Certificate Principal
                                                      Balance of the Class II-M-3
                                                     Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-3 Principal
                                                     Distribution Amount on such
                                                     Distribution Date), and

                                            (5)       the aggregate Stated
                                                     Principal Balance of the
                                                     Mortgage Loans in Loan
                                                     Group II as of the last day
                                                      of the related Due Period
                                                     (after reduction for
                                                     Realized Losses incurred
                                                      during the related Realized
                                                     Loss Period and Principal
                                                     Prepayments received during
                                                     the related Prepayment
                                                     Period) multiplied by (i)
                                                     on each Distribution Date
                                                     prior to the Distribution
                                                      Date in February 2013,
                                                     11.250% and (ii) on each
                                                     Distribution Date on and
                                                      after the Distribution Date
                                                     in February 2013, 9.000%,
                                                     and

                           II.       the excess of

                                     (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                             the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                             Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                            Cut-off Date.

                  Class II-M-5 Certificate: Any Certificate designated as a
"Class II-M-5 Certificate" on the face thereof, in the form of Exhibit A-2
hereto, representing the right to its Percentage Interest of distributions
provided for the Class II-M-5 Certificates as set forth herein.

                  Class II-M-5 Margin: For any Distribution Date (i) on or prior
to the Optional Termination Date, 1.000% per annum and (ii) thereafter, 1.500%
per annum.



                                       15
<PAGE>

                  Class II-M-5 Pass-Through Rate: For any Distribution Date, the
lesser of (i) One-Month LIBOR for the related Accrual Period plus the Class
II-M-5 Margin for such Distribution Date, (ii) 11.50% per annum, and (iii) the
applicable Interest Rate Cap for such Distribution Date.

                  Class II-M-5 Principal Distribution Amount: With respect to
any applicable Distribution Date, an amount equal to the excess, if any, of:

                  1.        the Certificate Principal Balance of the Class II-M-5
                           Certificates immediately prior to such Distribution
                           Date over

                  2.        the lesser of

                           I.        the excess of

                                    (a)      the aggregate Stated Principal
                                             Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                            the related Due Period (after
                                             reduction for Realized Losses
                                            incurred during the related Realized
                                            Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      the sum of

                                            (1)       the aggregate Certificate
                                                      Principal Balance of the
                                                     Class II-A Certificates
                                                     (after taking into account
                                                     the payment of the Class
                                                     II-A Principal Distribution
                                                     Amount on such Distribution
                                                     Date),

                                             (2)       the Certificate Principal
                                                     Balance of the Class II-M-1
                                                     Certificates (after taking
                                                      into account the payment of
                                                     the Class II-M-1 Principal
                                                     Distribution Amount on such
                                                      Distribution Date),

                                            (3)       the Certificate Principal
                                                     Balance of the Class II-M-2
                                                     Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-2 Principal
                                                     Distribution Amount on such
                                                     Distribution Date),

                                            (4)       the Certificate Principal
                                                     Balance of the Class II-M-3
                                                      Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-3 Principal
                                                      Distribution Amount on such
                                                     Distribution Date),

                                            (5)       the Certificate Principal
                                                     Balance of the Class II-M-4
                                                     Certificates (after taking
                                                     into account the payment of
                                                     the Class II-M-4 Principal
                                                     Distribution Amount on such
                                                     Distribution Date), and

                                            (6)       the aggregate Stated
                                                      Principal Balance of the
                                                     Mortgage Loans in Loan
                                                     Group II as of the last day
                                                      of the related Due Period
                                                     (after reduction for
                                                     Realized Losses incurred
                                                     during the related Realized
                                                     Loss Period and Principal


                                       16
<PAGE>

                                                     Prepayments received during
                                                      the related Prepayment
                                                     Period) multiplied by (i)
                                                     on each Distribution Date
                                                      prior to the Distribution
                                                     Date in February 2013,
                                                     8.750% and (ii) on each
                                                     Distribution Date on and
                                                     after the Distribution Date
                                                     in February 2013, 7.000%,
                                                     and

                           II. the excess of

                                    (a)      the aggregate Stated Principal
                                            Balance of the Mortgage Loans in
                                            Loan Group II as of the last day of
                                             the related Due Period (after
                                            reduction for Realized Losses
                                            incurred during the related Realized
                                             Loss Period and Principal
                                            Prepayments received during the
                                            related Prepayment Period), over

                                    (b)      0.50% of the aggregate Stated
                                            Principal Balance of the Mortgage
                                            Loans in Loan Group II as of the
                                            Cut-off Date.

                  Class II-P Certificate: Any Certificate designated as a "Class
II-P Certificate" on the face thereof, in the form of Exhibit A-4 hereto,
representing the right to its Percentage Interest of distributions provided for
the Class II-P Certificates as set forth herein.

                   Closing Date:   March 15, 2007.

                  Code:   The Internal Revenue Code of 1986, as amended,
including any successor or amendatory provisions.

                  Combined Loan-to-Value Ratio: The fraction, expressed as a
percentage, the numerator of which is the sum of (x) the original principal
balance of the related Mortgage Loan and (y) the outstanding principal balance
at the date of origination of the Mortgage Loan of any senior mortgage loan, and
the denominator of which is the Appraised Value of the related Mortgaged
Property.

                  Compensating Interest: With respect to any Mortgage Loan and
any Distribution Date, an amount, not to exceed the related Servicing Fee, to be
applied by the related Servicer pursuant to the related Servicing Agreement to
the payment of a Prepayment Interest Shortfall on such Mortgage Loan or by the
Master Servicer pursuant to Section 5.02 hereof.

                  Corporate Trust Office: The designated office of the Trustee
where at any particular time its corporate trust business with respect to this
Agreement shall be administered, which office at the date of the execution of
this Agreement is located at 388 Greenwich Street, 14th Floor, New York, New
York 10013, Attention: Structured Finance Agency & Trust BSABS 2007-SD2, or at
such other address as the Trustee may designate from time to time. With respect
to the Certificate Registrar and the presentment of Certificates for
registration of transfer, exchange or final payment, Wells Fargo Bank, N.A.,
Sixth Street and Marquette Avenue, Minneapolis, Minnesota 55479, Attention:
Corporate Trust, BSABS 2007-SD2, and for all other purposes, P.O. Box 98,
Columbia, Maryland 21046 (or for overnight deliveries, 9062 Old Annapolis Road,
Columbia, Maryland 21045), Attention: Corporate Trust, BSABS 2007-SD2.

                  Coupon Strip: With respect to Loan Group II and any
Distribution Date occurring in or after March 2017, in which an amount is
payable to the Final Maturity Reserve Account pursuant to Section 4.07, an
amount, if any, equal to the lesser of (a) the product of (i) one-twelfth of
0.90%, and (ii) the Stated Principal Balance of the Mortgage Loans in Loan Group
II with original terms to maturity in



                                        17
<PAGE>

excess of 30 years at the beginning of the related Due Period, and (b) the
amount, if any, which when added to amounts on deposit on the Final Maturity
Reserve Account on such Distribution Date would equal the Final Maturity Reserve
Account Target.

                  Credit Enhancement Percentage: With respect to Loan Group II
and any Distribution Date, the percentage obtained by dividing (x) the sum of
(i) the aggregate Certificate Principal Balance of the Group II Subordinate
Certificates, plus (ii) any Overcollateralization Amount (in each case after
taking into account distribution of the Principal Distribution Amount on such
Distribution Date), by (y) the aggregate Stated Principal Balances of the
Mortgage Loans in Loan Group II as of the last day of the related Due Period
(after reduction for Realized Losses incurred during the related Realized Loss
Period and prepayments received during the related Prepayment Period).

                  Cross-Over Date: The Distribution Date on which the
Certificate Principal Balances of the Group I Subordinate Certificates are
reduced to zero.

                  Cumulative Loss Test: With respect to Loan Group II and any
Distribution Date on or after the Stepdown Date, a Cumulative Loss Test will be
deemed to have been violated if the aggregate of related Realized Losses
(reduced by the aggregate amount of Subsequent Recoveries) from the Closing Date
through the last day of the related Realized Loss Period with respect to the
Mortgage Loans in Loan Group II, as a percentage of the aggregate Stated
Principal Balance of the Mortgage Loans in Loan Group II as of the Cut-off Date,
exceed for Distribution Dates occurring:

<TABLE>
<CAPTION>

        DISTRIBUTION DATE                                                             LOSS PERCENTAGE
        -----------------                                                            ---------------

        March 2009 through February 2010................................      1.25%

<S>                                                                            <C>
        March 2010 through February 2011................................      1.25% for the first month,
                                                                             plus an additional 1/12th of
                                                                              0.50% for each month
                                                                             thereafter

        March 2011 through February 2012................................      1.75% for the first month,
                                                                             plus an additional 1/12th of
                                                                             0.25% for each month
                                                                              thereafter

        March 2012 through February 2013................................      2.00% for the first month,
                                                                             plus an additional 1/12th of
                                                                             0.25% for each month
                                                                             thereafter

        March 2013 and each month thereafter............................      2.25%

</TABLE>

                  Current Interest: As of any Distribution Date, with respect to
each Class of Group II Offered Certificates, (i) the interest accrued on the
Certificate Principal Balance, during the related Accrual Period at the
applicable Pass-Through Rate plus any amount previously distributed with respect
to interest for such Certificate that has been recovered as a voidable
preference by a trustee in bankruptcy, minus, to the extent allocated to such
Class, (ii) the sum of (a) any Prepayment Interest Shortfall for such
Distribution Date, to the extent not covered by Compensating Interest, (b) any
shortfalls resulting from application of the Relief Act or similar state laws
during the related Due Period, and (c) any Net Deferred Interest for such
Distribution Date. For purposes of calculating Current Interest for any such
Class,



                                       18
<PAGE>

amounts specified in clause (ii) hereof for any such Distribution Date shall be
allocated first to the Class B-IO Certificates and the Residual Certificates in
reduction of amounts otherwise distributable to such Certificates on such
Distribution Date and then any excess shall be allocated to each Class of Group
II Certificates, pro rata, based on the respective amounts of interest accrued
pursuant to clause (i) hereof for each such Class on such Distribution Date.

                  Custodial Agreement: The Custodial Agreement, dated as of
March 15, 2007, among the Trustee, the Depositor, the Sponsor, the Master
Servicer, the Securities Administrator and the Custodian thereunder, as amended
or supplemented from time to time, in substantially the form of Exhibit K
hereto.

                  Custodian:   Wells Fargo Bank,   N.A., as custodian on behalf of
the Trustee   with respect to the Mortgage   Loans and related Mortgage Files held
by Wells Fargo Bank, N.A. pursuant to the Custodial Agreement

                  Cut-off Date:   The close of business on February 1, 2007.

                   Cut-off Date Principal Balance: As to any Mortgage Loan, the
unpaid principal balance thereof as of the close of business on the Cut-off Date
after application of all Principal Prepayments received prior to the Cut-off
Date and, except with respect to any Simple Interest Loans, scheduled payments
of principal due on or before the Cut-off Date, whether or not received but
without giving effect to any installments of principal received in respect of
Due Dates after the Cut-off Date. The aggregate Cut-off Date Principal Balance
of the Mortgage Loans is $350,840,007.38.

                  Deferred Interest: With respect to any negatively amortizing
Mortgage Loan, the excess of the amount of interest due on such negatively
amortizing Mortgage Loan over the interest portion of the scheduled payment due
thereon, which is permitted under the terms of the related Mortgage Note to be
added to the principal of the Mortgage Note.

                  Definitive Certificates:   As defined in Section 6.06.

                   Deleted Mortgage Loan: A Mortgage Loan replaced or to be
replaced by a Replacement Mortgage Loan.

                  Delinquency Test: With respect to Loan Group II and any
Distribution Date on or after the Stepdown Date, a Delinquency Test shall have
been violated if at any time, (x) the three-month rolling average of the percent
equivalent of a fraction, the numerator of which is the aggregate Stated
Principal Balance of the Mortgage Loans in Loan Group II that are 60 days or
more Delinquent or are in bankruptcy or foreclosure or are REO Properties, and
the denominator of which is the aggregate Stated Principal Balance of all of the
Mortgage Loans in Loan Group II as of the last day of the related Due Period
(after reduction for Realized Losses incurred during the related Realized Loss
Period and prepayments received during the related Prepayment period) equals or
exceeds (y) 34.00% of the Credit Enhancement Percentage.

                  Delinquent: A Mortgage Loan is "delinquent" if any payment due
thereon is not made pursuant to the terms of such Mortgage Loan by the close of
business on the day such payment is scheduled to be due. A Mortgage Loan is "30
days delinquent" if such payment has not been received by the close of business
on the corresponding day of the month immediately succeeding the month in which
such payment was due, or, if there is no such corresponding day (e.g., as when a
30-day month follows a 31-day month in which a payment was due on the 31st day
of such month), then on the last day of such immediately succeeding month.
Similarly for "60 days delinquent," "90 days delinquent" and so on.



                                       19
<PAGE>

                  Denomination: With respect to the Certificates, the amount set
forth on the face thereof as, in the case of a Certificate having a Certificate
Principal Balance, the "Initial Principal Balance of this Certificate," and, in
the case of a Class I-X Certificate, as the "Initial Principal Balance
(Notional) of this Certificate."

                   Depositor: Bear Stearns Asset Backed Securities I LLC, a
Delaware limited liability company, or its successor in interest.

                  Depositor Information:   As defined in Section 3.18(b).

                  Depository: The initial Depository shall be DTC, the nominee
of which is Cede, or any other organization registered as a "clearing agency"
pursuant to Section 17A of the Securities Exchange Act of 1934, as amended. The
Depository shall initially be the registered Holder of the Book-Entry
Certificates. The Depository shall at all times be a "clearing corporation" as
defined in Section 8-102(a)(5) of the Uniform Commercial Code of the State of
New York.

                  Depository Agreement: With respect to the Class of Book-Entry
Certificates, the agreement between the Trust and the initial Depository, dated
March 14, 2007, substantially in the form of Exhibit I.

                  Depository Participant: A broker, dealer, bank or other
financial institution or other Person for whom from time to time a Depository
effects book-entry transfers and pledges of securities deposited with the
Depository.

                  Determination Date: With respect to any Distribution Date and
Servicer, the date specified in the related Servicing Agreement.

                  Discount Mortgage Loan: A Sub-Loan Group I-1 Mortgage Loan
with a Net Mortgage Rate less than 5.500%.

                  Distribution Account: The separate Eligible Account created
and maintained by the Paying Agent pursuant to Section 4.04 in the name of the
Trustee for the benefit of the Certificateholders and designated "Citibank,
N.A., in trust for registered holders of Bear Stearns Asset Backed Securities
Trust 2007-SD2, Asset-Backed Certificates, Series 2007-SD2". Funds in the
Distribution Account shall be held in trust for the Certificateholders for the
uses and purposes set forth in this Agreement.

                  Distribution Date: The 25th day of each calendar month after
the initial issuance of the Certificates, or if such 25th day is not a Business
Day, the next succeeding Business Day, commencing in March 2007.

                  DTC: The Depository Trust Company, or its successors in
interest.

                  Due Date: As to any Mortgage Loan (other than a Simple
Interest Loan), the date in each month on which the related Scheduled Payment is
due, as set forth in the related Mortgage Note, and with respect to any Simple
Interest Loans, the last day of the immediately preceding Prepayment Period, if
its Scheduled Payment is due during such Prepayment Period.

                  Due Period: With respect to any Distribution Date and any
Mortgage Loan (other than any Simple Interest Loan), the period from the second
day of the calendar month preceding the calendar month in which such
Distribution Date occurs through close of business on the first day of the
calendar



                                       20
<PAGE>

month in which such Distribution Date occurs, and with respect to any Simple
Interest Loans, the calendar month immediately preceding the month in which such
Distribution Date occurs.

                  Eligible Account: Any of (i) an account or accounts maintained
with a federal or state chartered depository institution or trust company, the
long-term unsecured debt obligations and short-term unsecured debt obligations
of which (or, in the case of a depository institution or trust company that is
the principal subsidiary of a holding company, the debt obligations of such
holding company, but only if Moody's is not a Rating Agency) are rated by each
Rating Agency in one of its two highest long-term and its highest short-term
rating, respectively (or, if S&P is a Rating Agency, in its highest long-term
and one of its two highest short-term ratings, respectively,) at the time any
amounts are held on deposit therein, or (ii) an account or accounts in a
depository institution or trust company in which such accounts are insured by
the FDIC (to the limits established by the FDIC) and the uninsured deposits in
which accounts are otherwise secured such that, as evidenced by an Opinion of
Counsel delivered to the Trustee and to each Rating Agency, the
Certificateholders have a claim with respect to the funds in such account or a
perfected first priority security interest against any collateral (which shall
be limited to Permitted Investments) securing such funds that is superior to
claims of any other depositors or creditors of the depository institution or
trust company in which such account is maintained, or (iii) a trust account or
accounts maintained with the corporate trust department of a federal or state
chartered depository institution or trust company having capital and surplus of
not less than $50,000,000, acting in its fiduciary capacity or (iv) any other
account acceptable to the Rating Agencies. Eligible Accounts may bear interest,
and may include, if otherwise qualified under this definition, accounts
maintained with the Trustee, the Securities Administrator or the Master
Servicer.

                  EMC:   EMC Mortgage Corporation, a Delaware corporation.

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

                  ERISA Restricted Certificate: Each Class of Certificates other
than the Class A Certificates.

                   Event of Default:   As defined in Section 8.01 hereof.

                  Excess Cashflow: With respect to Loan Group II and any
Distribution Date, an amount, if any, equal to the sum of (a) the Excess
Overcollateralization Amount and (b) the Remaining Excess Spread, in each case
for such Distribution Date.

                  Excess Liquidation Proceeds: To the extent not required by law
to be paid to the related Mortgagor, the excess, if any, of any Liquidation
Proceeds with respect to a Mortgage Loan over the Stated Principal Balance of
such Mortgage Loan and accrued and unpaid interest at the related Mortgage Rate
through the last day of the month in which the Mortgage Loan has been
liquidated.

                  Excess Overcollateralization Amount: With respect to Loan
Group II and any Distribution Date, the lesser of (i) Principal Funds and (ii)
the excess, if any, of the Overcollateralization Amount over the Specified
Overcollateralization Amount for such Distribution Date.

                   Excess Spread: With respect to Loan Group II and any
Distribution Date, the excess, if any, of (i) Interest Funds for such
Distribution Date over (ii) the sum of (a) Current Interest on the Group II
Certificates and (b) Interest Carry Forward Amounts on the Class II-A
Certificates for such Distribution Date.

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



                                       21
<PAGE>

                  Extra Principal Distribution Amount: With respect to Loan
Group II and any Distribution Date, the lesser of (i) the excess, if any, of the
Specified Overcollateralization Amount for such Distribution Date over the
Overcollateralization Amount for such Distribution Date and (ii) the Excess
Spread for such Distribution Date.

                  Fannie Mae: Fannie Mae (also known as Federal National
Mortgage Association), or any successor thereto.

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

                   Final Maturity Reserve Account: The separate trust account
established and maintained by the Securities Administrator pursuant to Section
4.07 hereof.

                  Final Maturity Reserve Account Target: On any Distribution
Date occurring in or after March 2017, an amount equal to the lesser of (a) the
product of (i) the aggregate Stated Principal Balance of the Mortgage Loans in
Loan Group II with original terms to maturity in excess of 30 years as of the
related Due Date, and (ii) a fraction, the numerator of which is 1.00 and the
denominator of which is 0.85, and (b) $866,836.13.

                  FIRREA: The Financial Institutions Reform, Recovery, and
Enforcement Act of 1989.

                  Fiscal Quarter: December 1 through the last day of February,
March 1 through May 31, June 1 through August 31, or September 1 through
November 30, as applicable.

                  Fitch:   Fitch Ratings.

                  Freddie Mac: Freddie Mac (also known as Federal Home Loan
Mortgage Corporation), or any successor thereto.

                  Gross Margin: With respect to each Mortgage Loan that bears an
adjustable rate of interest, the fixed percentage set forth in the related
Mortgage Note and indicated on the Mortgage Loan Schedule which percentage is
added to the related Index on each Interest Adjustment Date to determine
(subject to rounding, the Minimum Lifetime Mortgage Rate, the Maximum Lifetime
Mortgage Rate and the Periodic Rate Cap, each as applicable) the Mortgage Rate
until the next succeeding Interest Adjustment Date.

                  Group I Non-Offered Certificates: The Class I-B-4
Certificates, the Class I-B-5 Certificates, the Class I-B-6 Certificates and the
Class I-P Certificates.

                  Group I Senior Certificates: The Class I-A Certificates, the
Class I-PO Certificates and the Class I-X Certificates.

                  Group I Subordinate Certificates:   The Class I-B Certificates.

                  Group II Non-Offered Certificates: The Class B-IO Certificates
and the Class II-P Certificates.

                  Group II Senior Certificates:   The Class II-A Certificates.

                  Group II Subordinate Certificates: The Class II-M
Certificates.



                                       22
<PAGE>

                   Indemnified Persons: The Trustee, the Master Servicer, the
Sponsor, the Depositor, the Custodian and the Securities Administrator and their
officers, directors, agents and employees and, with respect to the Trustee, any
separate co-trustee and its officers, directors, agents and employees.

                  Index: With respect to each Mortgage Loan that bears an
adjustable rate of interest, the index set forth in the related Mortgage Note
and indicated on the Mortgage Loan Schedule, by reference to which the related
Mortgage Rate will be adjusted from time to time.

                  Initial Certificate Principal Balance: With respect to any
Certificate, the Certificate Principal Balance of such Certificate or any
predecessor Certificate on the Closing Date.

                  Initial Overcollateralization Amount:   $7,120,624.32.

                  Insurance Policy: With respect to any Mortgage Loan included
in the Trust Fund, any insurance policy, including all riders and endorsements
thereto in effect with respect to such Mortgage Loan, including any replacement
policy or policies for any such insurance policies.

                  Insurance Proceeds: Proceeds paid in respect of the Mortgage
Loans pursuant to any Insurance Policy, to the extent such proceeds are not
applied to the restoration of the related Mortgaged Property or released to the
Mortgagor in accordance with the procedures that such Servicer would follow in
servicing mortgage loans held for its own account, in each case other than any
amount included in such Insurance Proceeds in respect of Insured Expenses and
exclusive of Subsequent Recoveries.

                  Insured Expenses: Expenses covered by an Insurance Policy or
any other insurance policy with respect to the Mortgage Loans.

                   Interest Carry Forward Amount: As of any Distribution Date and
with respect to each Class of Group II Offered Certificates, the sum of (i) the
excess of (a) the Current Interest for such Class with respect to prior
Distribution Dates over (b) the amount actually distributed to such Class with
respect to interest on such prior Distribution Dates and (ii) interest thereon
(to the extent permitted by applicable law) at the applicable Pass-Through Rate
for such Class for the related Accrual Period including the Accrual Period
relating to such Distribution Date.

                  Interest Determination Date: With respect to each Adjustable
Rate Certificate, for the first Accrual Period, March 13, 2007, and with respect
to any Accrual Period thereafter, the second LIBOR Business Day preceding the
commencement of such Accrual Period.

                  Interest Funds: With respect to Loan Group II and any
Distribution Date (i) the sum, without duplication, of the following amounts:
(a) all interest received during the related Due Period with respect to the
related Mortgage Loans less the related Servicing Fee, and Master Servicing Fee
referred to in clause (ii) of the definition thereof, (b) all Advances relating
to interest with respect to the related Mortgage Loans made on or prior to the
related Master Servicer Advance Date, (c) all Compensating Interest with respect
to the related Mortgage Loans and required to be remitted pursuant to the
related Servicing Agreement or this Agreement with respect to such Distribution
Date, (d) Liquidation Proceeds with respect to the related Mortgage Loans
collected during the related Liquidation Period (to the extent such Liquidation
Proceeds relate to interest), (e) all amounts relating to interest with respect
to each related Mortgage Loan repurchased by the Sponsor pursuant to Sections
2.02, 2.03 and 3.20, and (f) all amounts in respect of interest paid by EMC
pursuant to Section 10.01, in each case to the extent remitted by the Master
Servicer to the Distribution Account pursuant to this Agreement, minus (ii) all
amounts relating to interest reimbursed pursuant to Sections 4.05.



                                       23
<PAGE>

                  Interest-Only Certificates: The Class I-X Certificates.

                   Interest Rate Adjustment Date: With respect to each Mortgage
Loan that bears an adjustable rate of interest, the date set forth in the
related Mortgage Note and indicated on the Mortgage Loan Schedule, on which the
related Mortgage Rate is subject to adjustment.

                  Interest Rate Cap: For any Distribution Date and the Group II
Offered Certificates, the excess of (A) the weighted average of the Net Mortgage
Rates of the Mortgage Loans in Loan Group II as of the first day of the related
Due Period, adjusted to reflect the accrual of interest based on the actual
number of days elapsed in the related Accrual Period divided by 360, over (B)
the Coupon Strip, if any, payable to the Final Maturity Reserve Account, divided
by the outstanding Stated Principal Balance of the related Mortgage Loans as of
the related Due Date prior to giving effect to any reduction in the Stated
Principal Balances of the related Mortgage Loans on such Due Date, multiplied by
12.

                  Latest Possible Maturity Date: For the Group I Certificates
and the Group II Certificates, the Distribution Date in February 2037. For
purposes of the Treasury Regulations under Code section 860A through 860G, the
latest possible maturity date of each regular interest issued by REMIC I, REMIC
II, REMIC III and REMIC IV shall be the Latest Possible Maturity Date.

                  LIBOR Business Day: Any day on which banks in the London,
England and New York City, U.S.A. are open and conducting transactions in
foreign currency and exchange.

                  Liquidated Loan: With respect to any Distribution Date, a
defaulted Mortgage Loan that has been liquidated through deed-in-lieu of
foreclosure, foreclosure sale, trustee's sale or other realization as provided
by applicable law governing the real property subject to the related Mortgage
and any security agreements and as to which the related Servicer has certified
to the Master Servicer during the prior calendar month that it has received all
amounts it expects to receive in connection with such liquidation.

                  Liquidation Period: With respect to any Distribution Date, the
related monthly or other period described in the related Servicing Agreement
pursuant to which any Liquidation Proceeds are collected and remitted on the
related Servicer Remittance Date.

                  Liquidation Proceeds: Amounts, other than Insurance Proceeds
and Subsequent Recoveries, received in connection with the partial or complete
liquidation of a Mortgage Loan, whether through trustee's sale, foreclosure sale
or otherwise, or in connection with any condemnation or partial release of a
Mortgaged Property and any other proceeds received with respect to an REO
Property, less the sum of related unreimbursed Advances, Servicing Fees and
Servicing Advances and all expenses of liquidation, including property
protection expenses and foreclosure and sale costs, including court and
reasonable attorney's fees.

                  Loan Group:   Any of Loan Group I or Loan Group II.

                   Loan Group I: The pool of the Mortgage Loans consisting of the
Mortgage Loans included in Sub-Loan Group I-1, Sub-Loan Group I-2 and Sub-Loan
Group I-3.

                  Loan Group II: The pool of the Mortgage Loans consisting of
the Mortgage Loans included in Loan Group II.

                  Master Servicer: Wells Fargo Bank, N.A., a national banking
association, in its capacity as master servicer hereunder, and its successors
and assigns.



                                       24
<PAGE>

                  Master Servicer Advance Date: As to any Distribution Date, the
Business Day immediately preceding such Distribution Date.

                  Master Servicer Information:    As defined in Section 3.18(b).

                  Master Servicing Fee: For any Distribution Date, the sum of
(i) all income and gain, net of losses, realized from any investment of funds in
the Distribution Account since the prior Distribution Date and (ii) with respect
to each Mortgage Loan, an amount equal to 1/12th of the Master Servicing Fee
Rate multiplied by the Stated Principal Balance of such Mortgage Loan as of the
close of business on the first day of the month immediately preceding the month
in which such Distribution Date occurs.

                  Master Servicing Fee Rate: For each Distribution Date, 0.015%
per annum of the aggregate Stated Principal Balance of the Mortgage Loans as of
the first day of the month immediately preceding such Distribution Date.

                  Maximum Lifetime Mortgage Rate: As to each Mortgage Loan that
bears an adjustable rate of interest, the rate, if any, set forth in the related
Mortgage Note and indicated on the Mortgage Loan Schedule, that is the maximum
level to which a Mortgage Rate can adjust in accordance with its terms,
regardless of the change in the applicable Index.

                  MERS: Mortgage Electronic Registration Systems, Inc., a
corporation organized and existing under the laws of the State of Delaware, or
any successor thereto.

                  MERS(R) System: The system of recording transfers of Mortgages
electronically maintained by MERS.

                  MIN: The Mortgage Identification Number for Mortgage Loans
registered with MERS on the MERS(R) System.

                  Minimum Lifetime Mortgage Rate: As to each Mortgage Loan that
bears an adjustable rate of interest, the rate, if any, set forth in the related
Mortgage Note and indicated on the Mortgage Loan Schedule, that is the minimum
level to which a Mortgage Rate can adjust in accordance with its terms,
regardless of the change in the applicable Index.

                  MOM Loan: Any Mortgage Loan as to which, at origination
thereof, MERS acts as the mortgagee, solely as nominee for the originator of
such Mortgage Loan and its successors and assigns.

                  Monthly Statement: The statement delivered to the
Certificateholders pursuant to Section 5.05.

                  Moody's:   Moody's Investors Service, Inc.

                  Mortgage: The mortgage, deed of trust or other instrument
creating a first lien on or first priority ownership interest, or creating a
second lien on or second priority ownership interest, as applicable, in an
estate in fee simple in real property securing a Mortgage Note.

                  Mortgage File: The mortgage documents listed in Section 2.01
hereof pertaining to a particular Mortgage Loan and any additional documents
delivered to the Custodian on behalf of the Trustee to be added to the Mortgage
File pursuant to this Agreement.



                                        25
<PAGE>

                  Mortgage Loans: Such of the mortgage loans transferred and
assigned to the Trustee pursuant to the provisions hereof, as from time to time
are held as a part of the Trust Fund (including any REO Property), the mortgage
loans so held being identified in the Mortgage Loan Schedule, notwithstanding
foreclosure or other acquisition of title of the related Mortgaged Property. Any
mortgage loan that was intended by the parties hereto to be transferred to the
Trust Fund as indicated by such Mortgage Loan Schedule which is in fact not so
transferred for any reason including, without limitation, a breach of the
representation contained in Section 2.03(b)(v) hereof, shall continue to be a
Mortgage Loan hereunder until the Purchase Price with respect thereto has been
paid to the Trust Fund. The term Mortgage Loan shall not include any Liquidated
Loan.

                  Mortgage Loan Purchase Price: The price, calculated as set
forth in Section 10.01, to be paid in connection with the repurchase of the
Mortgage Loans pursuant to Section 10.01.

                  Mortgage Loan Schedule: The list of Mortgage Loans (as from
time to time amended by the Master Servicer to reflect the deletion of Deleted
Mortgage Loans and the addition of Replacement Mortgage Loans pursuant to the
provisions of this Agreement) transferred to the Trustee as part of the Trust
Fund and from time to time subject to this Agreement. The initial Mortgage Loan
Schedule is attached hereto as Exhibit B and sets forth the following
information with respect to each Mortgage Loan:

                  (i)       the loan number;

                  (ii)      the Servicer thereof;

                  (iii)     the Mortgage Rate in effect as of the Cut-off Date;

                  (iv)      the Master Servicing Fee Rate;

                  (v)       the related Servicing Fee Rate;

                  (vi)      the Net Mortgage Rate in effect as of the Cut-off
         Date;

                  (vii)     the stated maturity date;

                  (viii)    the original principal balance;

                  (ix)      the stated original term;

                  (x)       the next payment date as of the Cut-off Date;

                  (xi)      the monthly payment as of the Cut-off Date;

                  (xii)     the remaining term as of the Cut-off Date;

                  (xiii)    the property type;

                  (xiv)     if it is a first or second lien on the related
         Mortgaged Property;

                   (xv)      if applicable, that such Mortgage Loan is a Balloon
         Loan;

                  (xvi)     whether interest accrues at a fixed rate, and
         otherwise, the applicable Index (with respect to adjustable rate
         Mortgage Loans);



                                       26
<PAGE>

                  (xvii)    the Gross Margin, if applicable;

                  (xviii)   the intervals between Interest Adjustment Dates, if
         applicable;

                  (xix)     the next succeeding Interest Adjustment Date, if
         applicable, as of the Cut-off Date;

                  (xx)      the Periodic Rate Cap, if applicable;

                  (xxi)     the Minimum Lifetime Mortgage Rate, if applicable;

                  (xxii)    the Maximum Lifetime Mortgage Rate, if applicable;

                  (xxiii) the Combined Loan-to-Value Ratio as of the Cut-off
         Date;

                  (xxiv)    [Reserved];

                  (xxv)     the Cut-off Date Principal Balance;

                   (xxvi)    if applicable, that such Mortgage Loan is a Simple
         Interest Loan;

                  (xxvii)   if applicable, that such Mortgage Loan provides for
         negative amortization; and

                  (xxviii) the MIN with respect to each Mortgage Loan registered
         on the MERS(R) System.

Such schedule shall also set forth the total of the amounts described under
(xxv) above for all of the Mortgage Loans.

                  Mortgage Note: The original executed note or other evidence of
indebtedness of a Mortgagor under a Mortgage Loan.

                  Mortgage Rate: The annual rate of interest borne by a Mortgage
Note.

                  Mortgaged Property: The underlying property securing a
Mortgage Loan.

                  Mortgagor:   The obligor on a Mortgage Note.

                  Net Deferred Interest: With respect to the Mortgage Loans in
Loan Group II, on any Distribution Date, means the amount of Deferred Interest
on the related Mortgage Loans during the related Due Period net of Principal
Prepayments in full, partial Principal Prepayments, Net Liquidation Proceeds,
Repurchase Proceeds and scheduled principal payments, in that order, in each
case with respect to Loan Group II, included in the related available funds for
such Distribution Date and available to be distributed on the related
Certificates on that Distribution Date.

                  With respect to any Class of Group II Senior Certificates and
Group II Subordinate Certificates as of any Distribution Date, means an amount
equal to the product of (1) the excess, if any, of (a) the Pass-Through Rate for
such Class of Certificates, over (b) the Adjusted Rate Cap for such Class of
Certificates for such Distribution Date, (2) the Certificate Principal Balance
of such Class of Certificates immediately prior to such Distribution Date, and
(3) the actual number of days in such Accrual Period divided by 360.



                                       27
<PAGE>

                  Net Interest Shortfalls: With respect to Loan Group I and any
Distribution Date, the sum of Prepayment Interest Shortfalls on the related
Mortgage Loans, to the extent not covered by Compensating Interest, and interest
shortfalls on the related Mortgage Loans resulting from the application of the
Relief Act or similar state law, in each case with respect to such Distribution
Date.

                  Net Mortgage Rate: As to each Mortgage Loan, and at any time,
the per annum rate equal to the Mortgage Rate less the sum of the related
Servicing Fee Rate and the Master Servicing Fee Rate.

                  NIM Issuer: Any entity established as the issuer of NIM
Securities.

                  NIM Securities: Any debt securities secured or otherwise
backed by some or all of the Non-Offered Certificates.

                  NIM Trustee:   The trustee for any NIM Securities.

                  Non-Book-Entry Certificate: Any Certificate other than a
Book-Entry Certificate.

                  Non-Offered Certificates: The Group I Non-Offered
Certificates, the Group II Non-Offered Certificates, or the Residual
Certificates.

                  Non-PO Percentage: (a) With respect to each Mortgage Loan in
Loan Group I that is a Discount Mortgage Loan, the related Net Mortgage Rate
divided by 5.500%, and (b) with respect to each Mortgage Loan in Loan Group I
that is not a Discount Mortgage Loan, 100%.

                  Nonrecoverable Advance: Any portion of an Advance previously
made or proposed to be made by the Master Servicer that, in the good faith
judgment of the Master Servicer, will not or, in the case of a proposed advance,
would not, be ultimately recoverable by it from the related Mortgagor, related
Liquidation Proceeds or otherwise.

                  Notional Amount: The Notional Amount of the Class I-X
Certificates immediately prior to any Distribution Date, is equal to the
aggregate State Principal Balance of the Sub-Loan Group I-3 Mortgage Loans with
a Net Mortgage Rate greater than or equal to 6.500% per annum.

                  Offered Certificates: The Senior Certificates, the Group I
Subordinate Certificates (other than Group I Non-Offered Certificates) and the
Group II Subordinate Certificates (other than Group II Non-Offered
Certificates).

                  Officer's Certificate: A certificate (i) signed by the
Chairman of the Board, the Vice Chairman of the Board, the President, a Vice
President (however denominated), an Assistant Vice President, the Treasurer, the
Secretary, or one of the assistant treasurers or assistant secretaries of the
Depositor, EMC or the Master Servicer (or any other officer customarily
performing functions similar to those performed by any of the above designated
officers and also to whom, with respect to a particular matter, such matter is
referred because of such officer's knowledge of and familiarity with a
particular subject) or (ii), if provided for in this Agreement, signed by a
Servicing Officer, as the case may be, and delivered to the Depositor, the
Sponsor, the Securities Administrator, the Master Servicer and/or the Trustee,
as the case may be, as required by this Agreement.

                  One-Month LIBOR: With respect to any Accrual Period, the rate
determined by the Securities Administrator on the related Interest Determination
Date on the basis of the rate for U.S. dollar deposits for one month that
appears on Telerate Screen Page 3750 as of 11:00 a.m. (London time) on such


                                       28
<PAGE>

Interest Determination Date. If such rate does not appear on such page (or such
other page as may replace that page on that service, or if such service is no
longer offered, such other service for displaying One-Month LIBOR or comparable
rates as may be reasonably selected by the Securities Administrator), One-Month
LIBOR for the applicable Accrual Period will be the Reference Bank Rate. If no
such quotations can be obtained by the Securities Administrator and no Reference
Bank Rate is available, One-Month LIBOR will be One-Month LIBOR applicable to
the preceding Accrual Period. The establishment of One-Month LIBOR on each
Determination Date by the Securities Administrator and the Securities
Administrator's calculation of the rate of interest applicable to the
Certificates bearing interest based on One-Month LIBOR shall, in the absence of
manifest error, be conclusive and binding.

                  Opinion of Counsel: A written opinion of counsel, who may be
counsel for the Depositor or the Master Servicer, reasonably acceptable to each
addressee of such opinion; provided that with respect to Section 7.05 or 11.01,
or the interpretation or application of the REMIC Provisions, such counsel must
(i) in fact be independent of the Depositor and the Master Servicer, (ii) not
have any direct financial interest in the Depositor or the Master Servicer or in
any affiliate of either, and (iii) not be connected with the Depositor or the
Master Servicer as an officer, employee, promoter, underwriter, trustee,
partner, director or person performing similar functions.

                  Optional Termination: The termination of either Loan Group I
or Loan Group II as a result of the purchase of all of the Mortgage Loans in the
related Loan Group and any related REO Property pursuant to the last sentence of
Section 10.01 hereof.

                  Optional Termination Date: With respect to each Loan Group,
the Distribution Date on which the Stated Principal Balance of all of the
Mortgage Loans in the related Loan Group, and the Appraised Value of all related
REO Properties, at the time of repurchase is equal to or less than 10% of the
aggregate Cut-off Date Principal Balance of all of the Mortgage Loans in the
related Loan Group.

                  Original Group I Subordinate Principal Balance: The aggregate
Certificate Principal Balance of the Group I Subordinate Certificates as of the
Closing Date.

                  Original Value: The value of the property underlying a
Mortgage Loan based on an appraisal.

                  Originator: Any of the entities which either originated or
acquired a Mortgage Loan and transferred such Mortgage Loan to the Sponsor.

                  OTS:   The Office of Thrift Supervision.

                  Outstanding: With respect to the Certificates as of any date
of determination, all Certificates theretofore executed and authenticated under
this Agreement except:

                  (a)       Certificates theretofore canceled by the Certificate
                           Registrar or delivered to the Certificate Registrar
                           for cancellation; and

                   (b)       Certificates in exchange for which or in lieu of
                           which other Certificates have been executed and
                           delivered by the Certificate Registrar pursuant to
                           this Agreement.

                  Outstanding Mortgage Loan: As of any date of determination, a
Mortgage Loan with a Stated Principal Balance greater than zero that was not the
subject of a Principal Prepayment in full, and that did not become a Liquidated
Loan, prior to the end of the related Prepayment Period.



                                       29
<PAGE>

                  Overcollateralization Amount: With respect to Loan Group II
and any Distribution Date, the excess, if any, of (i) the aggregate Stated
Principal Balance of the Mortgage Loans in Loan Group II as of the last day of
the related Due Period (after reduction for Realized Losses incurred during the
related Realized Loss Period and prepayments received during the related
Prepayment Period), over (ii) the sum of the Certificate Principal Balances of
the Group II Offered Certificates (after taking into account the payment of
principal other than any Extra Principal Distribution Amount on such
Certificates) on such Distribution Date.

                   Overcollateralization Floor: With respect to Loan Group II and
any date of determination, 0.50% of the aggregate Cut-off Date Principal Balance
of the Mortgage Loans in Loan Group II.

                  Ownership Interest: As to any Certificate, any ownership
interest in such Certificate including any interest in such Certificate as the
Holder thereof and any other interest therein, whether direct or indirect, legal
or beneficial.

                  Pass-Through Rate: With respect to each Class of Certificates,
other than the Class I-PO Certificates, the Class P Certificates, the Class B-IO
Certificates and the Residual Certificates, the applicable interest rate for
each such Class as set forth in Section 6.01. The Class I-PO Certificates, the
Class P Certificates, the Class B-IO Certificates and the Residual Certificates
do not accrue interest and do not have a Pass-Through Rate.

                  Paying Agent: The Securities Administrator and any successor
paying agent appointed hereunder.

                   Percentage Interest: With respect to any Certificate of a
specified Class, the Percentage Interest set forth on the face thereof or the
percentage obtained by dividing the Denomination of such Certificate by the
aggregate of the Denominations of all Certificates of such Class.

                  Periodic Rate Cap: As to each Mortgage Loan that bears an
adjustable rate of interest, the rate, if any, set forth in the related Mortgage
Note and indicated on the Mortgage Loan Schedule, that is the maximum adjustment
that can be made to a Mortgage Rate on each Interest Adjustment Date in
accordance with its terms, regardless of the change in the applicable Index.

                  Permitted Investments: At any time, any one or more of the
following obligations and securities:

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

                  (ii) general obligations of or obligations guaranteed by any
         state of the United States or the District of Columbia receiving the
         highest long-term debt rating of each Rating Agency, or such lower
         rating as will not result in the downgrading or withdrawal of the
         ratings then assigned to the Certificates by each Rating Agency, as
         evidenced in writing;

                  (iii) commercial or finance company paper which is then
         receiving the highest commercial or finance company paper rating of
         each Rating Agency, or such lower rating as will not result in the
         downgrading or withdrawal of the ratings then assigned to the
         Certificates by each Rating Agency, as evidenced in writing;



                                        30
<PAGE>

                  (iv) certificates of deposit, demand or time deposits, or
         bankers' 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 (including the Trustee, the Securities
         Administrator and the Master Servicer in their commercial banking
         capacity), provided that the commercial paper and/or long term
         unsecured debt obligations of such depository institution or trust
         company are then rated one of the two highest long-term and the highest
         short-term ratings of each such Rating Agency for such securities, or
         such lower ratings as will not result in the downgrading or withdrawal
         of the rating then assigned to the Certificates by any Rating Agency,
         as evidenced in writing;

                  (v) guaranteed reinvestment agreements issued by any bank,
         insurance company or other corporation containing, at the time of the
         issuance of such agreements, such terms and conditions as will not
         result in the downgrading or withdrawal of the rating then assigned to
         the Certificates by each Rating Agency, as evidenced in writing;

                  (vi) repurchase obligations with respect to any security
         described in clauses (i) and (ii) above, in either case entered into
          with a depository institution or trust company (acting as principal)
         described in clause (v) above;

                  (vii) securities (other than stripped bonds, stripped coupons
         or instruments sold at a purchase price in excess of 115% of the face
         amount thereof) bearing interest or sold at a discount issued by any
         corporation incorporated under the laws of the United States or any
         state thereof which, at the time of such investment, have one of the
          two highest short term ratings of each Rating Agency (except if the
         Rating Agency is Moody's, such rating will be the highest commercial
         paper rating of Moody's for any such securities), or such lower rating
         as will not result in the downgrading or withdrawal of the rating then
         assigned to the Certificates by each Rating Agency, as evidenced by a
         signed writing delivered by each Rating Agency;

                  (viii) interests in any money market fund (including any such
         fund managed or advised by the Trustee, the Master Servicer, the
         Securities Administrator or any affiliate thereof) which at the date of
         acquisition of the interests in such fund and throughout the time such
          interests are held in such fund has the highest applicable short term
         rating by each Rating Agency rating such fund (and, so long as S&P is a
         Rating Agency, the long term ratings must be either AAAm or AAAm-G), or
         such lower rating as will not result in the downgrading or withdrawal
         of the ratings then assigned to the Certificates by each Rating Agency,
         as evidenced in writing;

                  (ix) short term investment funds sponsored by any trust
         company or banking association incorporated under the laws of the
         United States or any state thereof (including any such fund managed or
         advised by the Trustee, the Securities Administrator or the Master
         Servicer or any affiliate thereof) which on the date of acquisition has
         been rated by each Rating Agency in their respective highest applicable
         rating category or such lower rating as will not result in the
         downgrading or withdrawal of the ratings then assigned to the
         Certificates by each Rating Agency, as evidenced in writing; and

                  (x) such other investments having a specified stated maturity
         and bearing interest or sold at a discount acceptable to each Rating
         Agency and as will not result in the downgrading or withdrawal of the
         rating then assigned to the Certificates by any Rating Agency, as
         evidenced by a signed writing delivered by each Rating Agency;

                  provided, that no such instrument shall be a Permitted
Investment if such instrument (i) evidences the right to receive interest only
payments with respect to the obligations underlying such



                                       31
<PAGE>

instrument, (ii) is purchased at a premium or (iii) is purchased at a deep
discount; provided further that no such instrument shall be a Permitted
Investment (A) if such instrument evidences principal and interest payments
derived from obligations underlying such instrument and the interest payments
with respect to such instrument provide a yield to maturity of greater than 120%
of the yield to maturity at par of such underlying obligations, or (B) if it may
be redeemed at a price below the purchase price (the foregoing clause (B) not to
apply to investments in units of money market funds pursuant to clause (vii)
above); provided further that no amount beneficially owned by any REMIC
(including, without limitation, any amounts collected by the Master Servicer but
not yet deposited in the Distribution Account) may be invested in investments
(other than money market funds) treated as equity interests for Federal income
tax purposes, unless the Master Servicer shall receive an Opinion of Counsel, at
the expense of the Master Servicer, to the effect that such investment will not
adversely affect the status of any such REMIC as a REMIC under the Code or
result in imposition of a tax on any such REMIC. Permitted Investments that are
subject to prepayment or call may not be purchased at a price in excess of par.

                  Permitted Transferee: Any person other than (i) the United
States, any State or political subdivision thereof, or any agency or
instrumentality of any of the foregoing, (ii) a foreign government,
International Organization or any agency or instrumentality of either of the
foregoing, (iii) an organization (except certain farmers' cooperatives described
in section 521 of the Code) that is exempt from tax imposed by Chapter 1 of the
Code (including the tax imposed by section 511 of the Code on unrelated business
taxable income) on any excess inclusions (as defined in section 860E(c)(1) of
the Code) with respect to any Residual Certificate, (iv) rural electric and
telephone cooperatives described in section 1381(a)(2)(C) of the Code, (v) a
Person that is not a citizen or resident of the United States, a corporation,
partnership (other than a partnership that has any direct or indirect foreign
partners) or other entity (treated as a corporation or a partnership for federal
income tax purposes), created or organized in or under the laws of the United
States, any state thereof or the District of Columbia, an estate whose income
from sources without the United States is includible in gross income for United
States federal income tax purposes regardless of its connection with the conduct
of a trade or business within the United States, or a trust if a court within
the United States is able to exercise primary supervision over the
administration of the trust and one or more United States persons have authority
to control all substantial decisions of the trust or and (vi) any other Person
so designated by the Trustee based upon an Opinion of Counsel (which shall not
be an expense of the Trustee) that states that the Transfer of an Ownership
Interest in a Residual Certificate to such Person may cause the Trust Fund to
fail to qualify as a REMIC at any time that any Certificates are Outstanding.
The terms "United States," "State" and "International Organization" shall have
the meanings set forth in section 7701 of the Code or successor provisions. A
corporation will not be treated as an instrumentality of the United States or of
any State or political subdivision thereof for these purposes if all of its
activities are subject to tax and, with the exception of the Federal Home Loan
Mortgage Corporation, a majority of its board of directors is not selected by
such government unit.

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

                  PO Percentage: (a) With respect to each Mortgage Loan in Loan
Group I that is a Discount Mortgage Loan, 5.500% minus the related Net Mortgage
Rate, divided by 5.500%, and (b) with respect to each Mortgage Loan in Loan
Group I that is not a Discount Mortgage Loan, 0%.

                  Prepayment Assumption: The applicable rate of prepayment, as
described in the Prospectus Supplement relating to each Class of Offered
Certificates.



                                       32
<PAGE>

                  Prepayment Charge: Any prepayment premium, penalty or charge
payable by a Mortgagor in connection with any Principal Prepayment on a Mortgage
Loan pursuant to the terms of the related Mortgage Note.

                  Prepayment Charge Loan: Any Mortgage Loan for which a
Prepayment Charge may be assessed and to which such Prepayment Charge the Class
P Certificates are entitled, as indicated on the Mortgage Loan Schedule.

                  Prepayment Interest Shortfall: With respect to any
Distribution Date, for each Mortgage Loan that was the subject of a partial
Principal Prepayment or a Principal Prepayment in full during the related
Prepayment Period, or that became a Liquidated Loan during the prior calendar
month (other than a Principal Prepayment in full resulting from the purchase of
a Mortgage Loan pursuant to Section 2.02, 2.03, 3.20 or 10.01 hereof), the
amount, if any, by which (i) one month's interest at the applicable Net Mortgage
Rate on the Stated Principal Balance of such Mortgage Loan immediately prior to
such prepayment (or liquidation) or in the case of a partial Principal
Prepayment on the amount of such prepayment (or Liquidation Proceeds) exceeds
(ii) the amount of interest paid or collected in connection with such Principal
Prepayment or such Liquidation Proceeds.

                  Prepayment Period: With respect to any Distribution Date and
the Mortgage Loans serviced by a related Servicer, the monthly or other related
period preceding such Distribution Date described in the related Servicing
Agreement pursuant to which any prepayments on such Mortgage Loans are
determined with respect to such Distribution Date.

                  Primary Mortgage Insurance Policy: Any primary mortgage
guaranty insurance policy issued in connection with a Mortgage Loan which
provides compensation to a Mortgage Note holder in the event of default by the
obligor under such Mortgage Note or the related security instrument, if any or
any replacement policy therefor through the related Accrual Period for such
Class relating to a Distribution Date.

                  Principal Distribution Amount: With respect to Loan Group II
and any Distribution Date, an amount equal to (x) the Principal Funds for such
Distribution Date plus (y) any Extra Principal Distribution Amount for such
Distribution Date minus (z) any Excess Overcollateralization Amount for such
Distribution Date.

                  Principal Funds: With respect to Loan Group II and any
Distribution Date, (i) the sum, without duplication of (a) all scheduled
principal (or with respect to any Simple Interest Loans, actual principal)
collected during the related Due Period, (b) all Advances (except with respect
to any Simple Interest Loans) relating to principal made on or before the Master
Servicer Advance Date, (c) Principal Prepayments exclusive of Prepayment Charges
collected during the related Prepayment Period, (d) the Stated Principal Balance
of each related Mortgage Loan that was repurchased by the Sponsor pursuant to
Sections 2.02, 2.03 or 3.20, (e) the aggregate of all Substitution Adjustment
Amounts for the related Determination Date in connection with the substitution
of related Mortgage Loans pursuant to Section 2.03(c), (f) amounts in respect of
principal paid by the Depositor pursuant to Section 10.01 and (g) all
Liquidation Proceeds collected during the related Liquidation Period (to the
extent such Liquidation Proceeds relate to principal), less all non-recoverable
Advances relating to principal reimbursed during the related Liquidation Period
and all Subsequent Recoveries received during the related Liquidation Period and
minus (ii) the sum of (a) all amounts relating to principal or not allocable to
either interest or principal reimbursed pursuant to Section 4.05, and (b) the
amount of any Principal Prepayments in full, partial Principal Prepayments, Net
Liquidation Proceeds, Repurchase Proceeds and scheduled principal payments, in
that order, included in collections for the related Due Period that are applied
as Interest Funds in connection with any Deferred Interest with respect to such
Due Period.



                                       33
<PAGE>

                   Principal Prepayment: Any Mortgagor payment or other recovery
of (or proceeds with respect to) principal on a Mortgage Loan (including loans
purchased or repurchased under Sections 2.02, 2.03, 3.20 and 10.01 hereof) that
is received in advance of its scheduled Due Date and is not accompanied by an
amount as to interest representing scheduled interest due on any date or dates
in any month or months subsequent to the month of prepayment. Partial Principal
Prepayments shall be applied by the Master Servicer or the applicable Servicer,
as appropriate, in accordance with the terms of the related Mortgage Note.

                  Projected Principal Balance: With respect to each Yield
Maintenance Agreement for each applicable Distribution Date, the respective
amount set forth on Schedule III hereto.

                  Prospectus Supplement: The Prospectus Supplement dated March
14, 2007 relating to the public offering of the Offered Certificates, as amended
and supplemented.

                  Protected Account: An account established and maintained by
each Servicer with respect to receipts on the Mortgage Loans and REO Property
serviced by such Servicer in accordance with the related Servicing Agreement.

                  Protected Party:   As defined in Section 7.04 hereof.

                  PUD:   A Planned Unit Development.

                  Purchase Price: With respect to any Mortgage Loan (x) required
to be repurchased by the Sponsor pursuant to Section 2.02 or 2.03 hereof or (y)
that the Sponsor has a right to purchase pursuant to Section 3.20 hereof, an
amount equal to the sum of (i) 100% of the outstanding principal balance of the
Mortgage Loan as of the date of such purchase plus (ii) accrued interest thereon
at the applicable Mortgage Rate through the first day of the month in which the
Purchase Price is to be distributed to Certificateholders plus (iii) in the case
of a repurchase of such Mortgage Loan resulting from breach of the
representation or warranty contained in Section 2.03(b)(vii)(Q) or
2.03(b)(vii)(S), any costs or damages incurred by the Trust in connection with
the violation by such Mortgage Loan of any predatory or abusive lending law,
reduced by (iv) any portion of the Servicing Fee, Servicing Advances and
Advances payable to the purchaser of the Mortgage Loan.

                  Rating Agency: Each of S&P and Fitch, in the case of Group I
Certificates; and each of S&P and Moody's, in the case of Group II Certificates.
If any such organization or its successor is no longer in existence, "Rating
Agency" shall be a nationally recognized statistical rating organization, or
other comparable Person, designated by the Depositor, notice of which
designation shall be given to the Trustee. References herein to a given rating
category of a Rating Agency shall mean such rating category without giving
effect to any modifiers.

                  Realized Loss: With respect to each Liquidated Loan, an amount
(not less than zero or more than the Stated Principal Balance of the Mortgage
Loan) as of the date of such liquidation, equal to (i) the Stated Principal
Balance of such Liquidated Loan as of the date of such liquidation, minus (ii)
the Liquidation Proceeds, if any, received in connection with such liquidation
during the month in which such liquidation occurs, to the extent applied as
recoveries of principal of the Liquidated Loan.

                  Realized Loss Period: With respect to a Distribution Date, the
monthly or other related period preceding such Distribution Date described in
the related Servicing Agreement pursuant to which any Realized Losses are
determined with respect to such Distribution Date.



                                       34
<PAGE>

                  Record Date: With respect to the Adjustable Rate Certificates
and any Distribution Date, so long as such Certificates are Book-Entry
Certificates, the Business Day preceding such Distribution Date, and otherwise,
the close of business on the last Business Day of the month preceding the month
in which such Distribution Date occurs. With respect to each Class of
Certificates (other than the Adjustable Rate Certificates) and (a) the first
Distribution Date, the Closing Date, and (b) with respect to any other
Distribution Date, the close of business on the last Business Day of the month
immediately preceding the month in which such Distribution Date occurs.

                  Reference Bank Rate: With respect to the Adjustable Rate
Certificates and any Accrual Period, the arithmetic mean (rounded upwards, if
necessary, to the nearest whole multiple of 0.03125%) of the offered rates for
United States dollar deposits for one month that are quoted by the Reference
Banks as of 11:00 a.m., New York City time, on the related Interest
Determination Date to prime banks in the London interbank market for a period of
one month in amounts approximately equal to the aggregate Certificate Principal
Balance of all Adjustable Rate Certificates on such Interest Determination Date,
provided that at least two such Reference Banks provide such rate. If fewer than
two offered rates appear, the Reference Bank Rate will be the arithmetic mean
(rounded upwards, if necessary, to the nearest whole multiple of 0.03125%) of
the rates quoted by one or more major banks in New York City, selected by the
Securities Administrator, as of 11:00 a.m., New York City time, on such date for
loans in U.S. dollars to leading European banks for a period of one month in
amounts approximately equal to the aggregate Certificate Principal Balance of
the Certificates which bear an adjustable rate of interest on such Interest
Determination Date.

                  Reference Banks: Barclays Bank PLC, Citibank, N.A. and
Deutsche Bank AG, provided that if any of the foregoing banks are not suitable
to serve as a Reference Bank, then any leading banks selected by the Securities
Administrator which are engaged in transactions in Eurodollar deposits in the
international Eurocurrency market (i) with an established place of business in
London, England, (ii) not controlling, under the control of or under common
control with the Depositor, the Sponsor, the Master Servicer or any affiliate
thereof and (iii) which have been designated as such by the Securities
Administrator.

                  Regular Certificate: Any Certificate other than a Residual
Certificate.

                  Regulation AB: Subpart 229.1100 - Asset Backed Securities
(Regulation AB), 17 C.F.R. ss.ss.229.1100-229.1123, as such may be amended from
time to time, and subject to such clarification and interpretation as have been
provided by the Commission in the adopting release (Asset-Backed Securities,
Securities Act Release No. 33-8518, 70 Fed. Reg. 1,506, 1,531 (Jan. 7, 2005)) or
by the staff of the Commission, or as may be provided by the Commission or its
staff from time to time.

                  Relief Act: The Servicemembers Civil Relief Act, as amended,
or any similar state or local law.

                  Remaining Excess Spread: With respect to Loan Group II and any
Distribution Date, the Excess Spread less any Extra Principal Distribution
Amount, in each case for such Distribution Date.

                  REMIC: A "real estate mortgage investment conduit" within the
meaning of section 860D of the Code.

                  REMIC I: The segregated pool of assets described in Section
5.06(a).

                  REMIC I Certificates: The REMIC I Regular Interests and the
Class R-I Certificate.



                                       35
<PAGE>

                  REMIC I Regular Interests: As defined in Section 5.06(b)(i).

                  REMIC II: The segregated pool of assets consisting of the
REMIC I regular interests and constituting a REMIC hereunder.

                  REMIC II Certificates: The REMIC II Regular Interests and the
Class R-II Certificate.

                   REMIC II Regular Interests: As defined in Section 5.06(b)(ii).

                  REMIC III: The segregated pool of assets consisting of the
REMIC II regular interests and constituting a REMIC hereunder.

                  REMIC III Certificates: The REMIC III Regular Interests and
the Class R-III Certificate.

                  REMIC III Regular Interests: As defined in Section
5.06(b)(iii).

                  REMIC IV: The segregated pool of assets consisting of the
REMIC III Class P Certificates and constituting a REMIC hereunder.

                  REMIC IV Certificates: The REMIC IV Class P Regular Interest
and the Class R-X Certificate.

                  REMIC IV Regular Interest: As defined in Section 5.06(b)(iv).

                  REMIC Opinion: An Opinion of Counsel, to the effect that the
proposed action described therein would not, under the REMIC Provisions, (i)
cause either REMIC I, REMIC II, REMIC III or REMIC IV to fail to qualify as a
REMIC while any regular interest in any such REMIC is outstanding, (ii) result
in a tax on prohibited transactions or (iii) constitute a taxable contribution
after the Startup Day.

                  REMIC Provisions: Provisions of the federal income tax law
relating to real estate mortgage investment conduits, which appear at sections
860A through 860G of Subchapter M of Chapter 1 of the Code, and related
provisions, and proposed, temporary and final regulations and published rulings,
notices and announcements promulgated thereunder, as the foregoing may be in
effect from time to time as well as provisions of applicable state laws.

                  Remittance Report:   As defined in Section 4.05(c).

                  REO Property: A Mortgaged Property acquired by a Servicer
through foreclosure or deed-in-lieu of foreclosure in connection with a
defaulted Mortgage Loan.

                  Replacement Mortgage Loan: A Mortgage Loan or Mortgage Loans
in the aggregate substituted by the Sponsor for a Deleted Mortgage Loan, which
must, on the date of such substitution, as confirmed in a Request for Release,
(i) have a Stated Principal Balance, after deduction of the principal portion of
the Scheduled Payment due in the month of substitution, not in excess of, and
not less than 90% of the Stated Principal Balance of the Deleted Mortgage Loan;
(ii) have a Mortgage Rate not less than or more than 1% per annum higher than
the Mortgage Rate of the Deleted Mortgage Loan; (iii) have the same or higher
credit quality characteristics than that of the Deleted Mortgage Loan; (iv) have
a Combined Loan-to-Value Ratio no higher than that of the Deleted Mortgage Loan;
(v) have a remaining term to maturity no greater than (and not more than one
year less than) that of the Deleted Mortgage Loan; (vi) not permit conversion of
the Mortgage Rate from a fixed rate to a variable rate; (vii) provide



                                       36
<PAGE>

for a Prepayment Charge on terms substantially similar to those of the
Prepayment Charge, if any, of the Deleted Mortgage Loan; (viii) have the same
lien priority as the Deleted Mortgage Loan; (ix) constitute the same occupancy
type as the Deleted Mortgage Loan or be owner occupied; (x) be current in
payment of principal and interest as of the date of substitution; (xi) have
payment terms that do not vary in any material respect from the payment terms of
the Mortgage Loan for which it is to be substituted; (xii) if the Deleted
Mortgage Loan bears an adjustable rate of interest, have a Gross Margin,
Periodic Rate Cap and Maximum Lifetime Mortgage Rate no less than those of the
Deleted Mortgage Loan, have the same Index and interval between Interest
Adjustment Dates, and a Minimum Lifetime Mortgage Rate no lower than that of
such Deleted Mortgage Loan; and (xiii) comply with each representation and
warranty set forth in Section 2.03 hereof.

                  Reportable Event:   As defined in Section 3.18(a)(ii).

                  Request for Release: The Request for Release to be submitted
by the Sponsor, a Servicer or the Master Servicer to the Custodian,
substantially in the form of Exhibit H. Each Request for Release furnished to
the Custodian by the Sponsor, a Servicer or the Master Servicer shall be in
duplicate and shall be executed by a Servicing Officer (or, if furnished
electronically to the Custodian, shall be deemed to have been sent and executed
by a Servicing Officer) of the Sponsor, the Servicer or the Master Servicer, as
applicable.

                  Required Insurance Policy: With respect to any Mortgage Loan,
any insurance policy that is required to be maintained from time to time under
this Agreement or the related Servicing Agreement.

                  Residual Certificates: The Class R-I Certificate, Class R-II
Certificate, Class R-III Certificate and Class R-X Certificate.

                  Responsible Officer: With respect to the Trustee, any Vice
President, any Assistant Vice President, the Secretary, any Assistant Secretary,
any Trust Officer with specific responsibility for the transaction contemplated
hereby or other officers of the Trustee specified by the Trustee, as to whom,
with respect to a particular matter, such matter is referred because of such
officer's knowledge of and familiarity with the particular subject.

                  S&P: Standard & Poor's, a division of The McGraw-Hill
Companies, Inc.

                  Sarbanes-Oxley Act: The Sarbanes-Oxley Act of 2002 and the
rules and regulations of the Commission promulgated thereunder (including any
interpretation thereof by the Commission's staff).

                   Sarbanes-Oxley Certification: As defined in Section
3.18(a)(iii)(D).

                  Scheduled Payment: The scheduled monthly payment on a Mortgage
Loan due on any Due Date allocable to principal and/or interest on such Mortgage
Loan.

                   Securities Act:   The Securities Act of 1933, as amended.

                  Securities Administrator: Wells Fargo Bank, N.A., in its
capacity as securities administrator hereunder, and its successors and assigns.

                  Securities Administrator Fee: For any Distribution Date, a fee
payable to the Securities Administrator by the Master Servicer out of its own
funds in such capacity as they may separately agree.



                                       37
<PAGE>

                   Securities Administrator Information: As defined in Section
3.18(b).

                  Senior Certificates: The Group I Senior Certificates and the
Group II Senior Certificates.

                  Senior Optimal Principal Amount: With respect to each Sub-Loan
Group included in Loan Group I and each Distribution Date, will be an amount
equal to the sum of the following (but in no event greater than the aggregate
Certificate Principal Balance of the related Certificate Group immediately prior
to such Distribution Date):

                  (1) the Senior Percentage of the Non-PO Percentage of the
         principal portion of all monthly payments due on the Mortgage Loans in
         the related Sub-Loan Group on the related Due Date, as specified in the
          amortization schedule at the time applicable thereto (after adjustment
         for previous principal prepayments but before any adjustment to such
         amortization schedule by reason of any bankruptcy or similar proceeding
         or any moratorium or similar waiver or grace period if the Distribution
         Date occurs prior to a Cross-Over Date);

                  (2) the Senior Prepayment Percentage of the Non-PO Percentage
         of the Stated Principal Balance of each Mortgage Loan in the related
         Sub-Loan Group which was the subject of a prepayment in full received
         by a Servicer during the applicable Prepayment Period;

                  (3) the Senior Prepayment Percentage of the Non-PO Percentage
         of the amount of all partial prepayments allocated to principal
         received during the applicable Prepayment Period in respect of Mortgage
         Loans in the related Sub-Loan Group;

                  (4) the lesser of (a) the Senior Prepayment Percentage of the
         Non-PO Percentage of the sum of (i) all Net Liquidation Proceeds
         allocable to principal received in respect of each Mortgage Loan in the
         related Sub-Loan Group that became a Liquidated Mortgage Loan during
         the related Liquidation Period (other than Mortgage Loans described in
         the immediately following clause (ii)) and all Subsequent Recoveries
         received in respect of each Liquidated Mortgage Loan in the related
         Sub-Loan Group during the related Due Period and (ii) the Stated
         Principal Balance of each such Mortgage Loan in the related Sub-Loan
         Group purchased by an insurer from the Trust during the related
         Prepayment Period pursuant to the related primary mortgage insurance
         policy, if any, or otherwise; and (b) the Senior Percentage of the
         Non-PO Percentage of the sum of (i) the Stated Principal Balance of
         each Mortgage Loan in the related Sub-Loan Group which became a
         Liquidated Mortgage Loan during the related Prepayment Period (other
         than the Mortgage Loans described in the immediately following clause
         (ii)) and all Subsequent Recoveries received in respect of each
         Liquidated Mortgage Loan in the related Sub-Loan Group during the
         related Due Period and (ii) the Stated Principal Balance of each such
         Mortgage Loan in the related Sub-Loan Group that was purchased by an
         insurer from the Trust during the related Prepayment Period pursuant to
         the related primary mortgage insurance policy, if any or otherwise;

                  (5) any amount allocated to the Available Funds of the related
         Sub-Loan Group in accordance with clauses (E) and (F) under subsection
          5.04(a)(I)(i); and

                  (6) the Senior Prepayment Percentage of the Non-PO Percentage
         of the sum of (a) the Stated Principal Balance of each Mortgage Loan in
         the related Sub-Loan Group which was repurchased by the Sponsor in
         connection with such Distribution Date and (b) the excess, if any, of
         the Stated Principal Balance of a Mortgage Loan in the related Sub-Loan
         Group that has been replaced by the Sponsor with a substitute Mortgage
         Loan pursuant to this Agreement in


                                       38
<PAGE>

         connection with such Distribution Date over the Stated Principal
         Balance of such substitute Mortgage Loan.

                  Senior Percentage: With respect to each Certificate Group
related to a Sub-Loan Group in Loan Group I and any Distribution Date, is the
lesser of (a) 100% and (b) the percentage obtained by dividing the Certificate
Principal Balance of the Group I Senior Certificates (other than the Class I-X
and Class I-PO certificates) in the related Certificate Group by the aggregate
Stated Principal Balance of the Mortgage Loans in the related Sub-Loan Group in
Loan Group I (other than the PO Percentage thereof with respect to the related
Discount Mortgage Loans) as of the beginning of the related Due Period. The
initial Group I Senior Percentage for each Certificate Group related to a
Sub-Loan Group in Loan Group I will be equal to approximately 83.95%.

                  Senior Prepayment Percentage: The Senior Prepayment Percentage
for the Group I Senior Certificates (other than the Class I-X and Class I-PO
Certificates) of each Certificate Group related to a Sub-Loan Group in Loan
Group I, on any Distribution Date occurring during the periods set forth below
will be as follows:

Period (dates inclusive)             Senior Prepayment Percentage
---------------------------          --------------------------------------------

March 2007 - February 2012           100%

March 2012 - February 2013            Senior   Percentage for the related Senior
                                    Certificates plus 70% of the Subordinate
                                    Percentage for the related Sub-Loan Group.

March 2013 - February 2014           Senior Percentage for the related Senior
                                    Certificates plus 60% of the Subordinate
                                    Percentage for the related Sub-Loan Group.

March 2014 - February 2015           Senior Percentage for the related Senior
                                    Certificates plus 40% of the Subordinate
                                    Percentage for the related Sub-Loan Group.

March 2015 - February 2016           Senior Percentage for the related Senior
                                     Certificates plus 20% of the Subordinate
                                    Percentage for the related Sub-Loan Group.

March 2016 and thereafter            Senior Percentage for the related senior
                                     certificates.

                  No scheduled reduction to the Senior Prepayment Percentage for
the related Certificate Group shall be made as of any Distribution Date unless,
as of the last day of the month preceding such Distribution Date (1) the
aggregate Stated Principal Balance of the Mortgage Loans in all Sub-Loan Groups
in Loan Group I delinquent 60 days or more (including for this purpose any such
Mortgage Loans in foreclosure and such Mortgage Loans with respect to which the
related Mortgaged Property has been acquired by the Trust) averaged over the
last six months, as a percentage of the aggregate Certificate Principal Balance
of the Group I Subordinate Certificates does not exceed 50% and (2) cumulative
Realized Losses on the Mortgage Loans in all Sub-Loan Groups in Loan Group I do
not exceed (a) 30% of the aggregate Certificate Principal Balance of the
Original Group I Subordinate Principal Balance if such Distribution Date occurs
between and including March 2012 and February 2013, (b) 35% of the Original
Group I Subordinate Principal Balance if such Distribution Date occurs between
and including March 2013 and February 2014, (c) 40% of the Original Group I
Subordinate Principal Balance if such Distribution Date occurs between and
including March 2014 and February 2015, (d) 45% of the Original Group I
Subordinate Principal Balance if such Distribution Date occurs between and
including March



                                       39
<PAGE>

2015 and February 2016, and (e) 50% of the Original Group I Subordinate
Principal Balance if such Distribution Date occurs during or after March 2016.


                  Notwithstanding the foregoing, if on any Distribution Date,
the percentage, the numerator of which is the aggregate Certificate Principal
Balance of the Group I Senior Certificates (other than the Class I-X
Certificates) immediately preceding such Distribution Date, and the denominator
of which is the Stated Principal Balance of the Mortgage Loans in Loan Group I
as of the beginning of the related Due Period, exceeds such percentage as of the
Cut-off Date, then the Senior Prepayment Percentage with respect to all the
Group I Senior Certificates for such Distribution Date will equal 100%.

                  Servicer: Each of EMC Mortgage Corporation, Wells Fargo Bank,
N.A. and GMAC Mortgage LLC, in each case pursuant to the applicable Servicing
Agreement, and their respective permitted successors and assigns.

                  Servicer Remittance Date: With respect to each Mortgage Loan
and related Servicer, the date set forth in the related Servicing Agreement,
when the related Servicer is required to remit funds in the related Protected
Account to the Master Servicer.

                  Servicing Agreement: Any servicing agreement set forth on
Schedule I hereto, including the related Assumption Agreement.

                  Servicing Advances: All customary, reasonable and necessary
"out of pocket" costs and expenses (including reasonable legal fees) incurred in
the performance by a Servicer of its servicing obligations under the related
Servicing Agreement, including, but not limited to, the cost of (i) the
preservation, restoration and protection of a Mortgaged Property, (ii) any
enforcement or judicial proceedings, including foreclosures, and including any
expenses incurred in relation to any such proceedings that result from a
Mortgage Loan being registered in the MERS(R) System, (iii) the management and
liquidation of any REO Property (including, without limitation, realtor's
commissions) and (iv) compliance with any obligations under a Servicing
Agreement or Section 3.09 hereof to cause insurance to be maintained.

                  Servicing Criteria: The "servicing criteria" set forth in Item
1122(d) of Regulation AB, as such may be amended from time to time, or those
Servicing Criteria otherwise mutually agreed to by EMC, the Master Servicer, the
Securities Administrator and the applicable Servicer in response to evolving
interpretations of Regulation AB and incorporated into a revised Exhibit L.

                  Servicing Fee: As to each Mortgage Loan and any Distribution
Date, an amount equal to 1/12th of the Servicing Fee Rate multiplied by the
Stated Principal Balance of such Mortgage Loan as of the close of business on
the first day of the month immediately preceding the month in which such
Distribution Date occurs or, in the event of any payment of interest that
accompanies a Principal Prepayment in full during the related Due Period made by
the Mortgagor immediately prior to such prepayment, interest at the Servicing
Fee Rate on the Stated Principal Balance of such Mortgage Loan for the period
covered by such payment of interest.

                  Servicing Fee Rate: With respect to each Mortgage Loan, the
per annum rate set forth in the Mortgage Loan Schedule under the heading
"Servicing Fee."

                  Servicing Officer: Any officer of a Servicer or the Master
Servicer involved in, or responsible for, the administration and servicing or
master servicing of the Mortgage Loans, as to which evidence reasonably
acceptable to the Custodian or the Trustee, as applicable, of due authorization,
by such party has been furnished from time to time to the Custodian or the
Trustee, as applicable.



                                        40
<PAGE>

                  Significance Estimate: With respect to any Distribution Date,
and in accordance with Item 1115 of Regulation AB, shall be an amount determined
based on the reasonable good-faith estimate by the Depositor of the aggregate
maximum probable exposure of the outstanding Group II Offered Certificates to
the Yield Maintenance Agreements.

                  Significance Percentage: With respect to any Distribution
Date, and in accordance with Item 1115 of Regulation AB, shall be an percentage
equal to the Significance Estimate divided by the aggregate outstanding
Certificate Principal Balance of the Group II Offered Certificates, prior to the
distribution of the related Principal Distribution Amount on such Distribution
Date.

                   Simple Interest Loan: A Mortgage Loan that provides for daily
accrual of interest and is identified as such on the Mortgage Loan Schedule.
None of the Mortgage Loans is a Simple Interest Loan.

                  Specified Overcollateralization Amount: With respect to Loan
Group II and any Distribution Date:

                  (i)       prior to the Stepdown Date, 3.50% of the aggregate
                           Stated Principal Balance of the Mortgage Loans in
                           Loan Group II as of the Cut-off Date,

                  (ii)      on or after the Stepdown Date, provided a Trigger
                           Event is not in effect, the greater of:

                           (x)       the product of (a) on each Distribution Date
                                    prior to the Distribution Date in February
                                    2013, 8.75%, and on each Distribution Date
                                    on or after the Distribution Date in
                                     February 2013, 7.00%, and (b) the aggregate
                                    Stated Principal Balance of the Mortgage
                                    Loans in Loan Group II as of the last day of
                                    the related Due Period (after reduction for
                                    Realized Losses incurred during the related
                                    Realized Loss Period and prepayments
                                    received during the related Prepayment
                                    Period), and

                           (y)       the Overcollateralization Floor; or

                  (iii)     on and after the Stepdown Date, and if a Trigger
                           Event is in effect, the Specified
                           Overcollateralization Amount for the immediately
                           preceding Distribution Date.

                  Sponsor: EMC, in its capacity as seller of the Mortgage Loans
to the Depositor.

                   Startup Day: The startup day, within the meaning of Section
860G(a)(9), for each REMIC formed hereunder shall be the Closing Date.

                  Stated Principal Balance: With respect to any Mortgage Loan or
related REO Property and any Distribution Date, the Cut-off Date Principal
Balance thereof, plus with respect to any negatively amortizing Mortgage Loan,
the amount of any Net Deferred Interest added to the principal balance thereof,
minus the sum of (i) the principal portion of the Scheduled Payments due (or,
with respect to any Simple Interest Loans, the principal portion of payments
actually received) with respect to such Mortgage Loan during each related Due
Period ending prior to such Distribution Date (and other than with respect to
any Simple Interest Loans irrespective of any delinquency in their payment),
(ii) all Principal Prepayments with respect to such Mortgage Loan received prior
to or during the related Prepayment Period, and all Liquidation Proceeds to the
extent applied by the related Servicer as recoveries of principal in accordance
with Section 3.13 with respect to such Mortgage Loan, that were received by the


                                       41
<PAGE>

related Servicer prior to or during the related Liquidation Period, and (iii)
any Realized Losses on such Mortgage Loan incurred during the related Realized
Loss Period. The Stated Principal Balance of a Liquidated Loan equals zero.

                  Stepdown Date: With respect to Loan Group II and any
Distribution Date, the earlier to occur of:

                  (i)       the Distribution Date on which the aggregate
                           Certificate Principal Balance of the Class II-A
                           Certificates has been reduced to zero; and

                   (ii)      the later to occur of

                           (x)       the Distribution Date occurring in March
                                    2010, and

                           (y)       the first Distribution Date for which the
                                     aggregate Certificate Principal Balance of
                                    the Group II Subordinate Certificates plus
                                    the Overcollateralization Amount for such
                                     Distribution Date divided by the sum of the
                                    Stated Principal Balances of the Mortgage
                                    Loans in Loan Group II as of the end of the
                                    related Due Period (after reduction for
                                    Realized Losses incurred during the related
                                    Realized Loss Period and prepayments
                                    received during the related Prepayment
                                    Period) is greater than or equal to (A) on
                                    each Distribution Date prior to the
                                    Distribution Date in February 2013, 38.250%,
                                     and (B) on each distribution date on and
                                    after the distribution date in February
                                    2013, 30.600%.

                  Strike Rate: With respect to the Yield Maintenance Agreements,
as set forth in Schedule III hereto.

                  Subcontractor: Any vendor, subcontractor or other Person that
is not responsible for the overall servicing of Mortgage Loans but performs one
or more discrete functions identified in Item 1122(d) of Regulation AB with
respect to Mortgage Loans under the direction or authority of any Servicer (or a
Subservicer of any Servicer), the Master Servicer, the Custodian or the
Securities Administrator.

                  Sub-Loan Group: Either Sub-Loan Group I-1, Sub-Loan Group I-2,
Sub-Loan Group I-3, Sub-Loan Group II-1, Sub-Loan Group II-2 or Sub-Loan Group
II-3, as applicable.

                  Sub-Loan Group I-1: With respect to the Mortgage Loans, the
pool of Mortgage Loans identified in the Mortgage Loan Schedule as composing
Sub-Loan Group I-1. With respect to the Certificates, the Class I-A-1A
Certificates, the Class I-A-1B Certificates and the Class I-PO Certificates.

                  Sub-Loan Group I-2: With respect to the Mortgage Loans, the
pool of Mortgage Loans identified in the Mortgage Loan Schedule as composing
Sub-Loan Group I-2. With respect to the Certificates, the Class I-A-2A
Certificates and the Class I-A-2B Certificates.

                  Sub-Loan Group I-3: With respect to the Mortgage Loans, the
pool of Mortgage Loans identified in the Mortgage Loan Schedule as composing
Sub-Loan Group I-3. With respect to the Certificates, the Class I-A-3A
Certificates, the Class I-A-3B Certificates and the Class I-X Certificates.

                   Sub-Loan Group I-1 Fraction: With respect to any Mortgage Loan
in Loan Group I with a Net Mortgage Rate of greater than or equal to 5.500% per
annum and less than 6.000% per annum, a



                                       42
<PAGE>

fraction, (x) the numerator of which is equal to 6.000% minus the Net Mortgage
Rate of such Mortgage Loan, and (y) the denominator of which is equal to 0.500%.

                  Sub-Loan Group I-2A Fraction: With respect to any Mortgage
Loan in Loan Group I with a Net Mortgage Rate of greater than or equal to 5.500%
per annum and less than 6.000% per annum, a fraction, (x) the numerator of which
is equal to Net Mortgage Rate minus 5.500% of such Mortgage Loan, and (y) the
denominator of which is equal to 0.500%.

                   Sub-Loan Group I-2B Fraction: With respect to any Mortgage
Loan in Loan Group I with a Net Mortgage Rate of greater than or equal to 6.000%
per annum and less than 6.500% per annum, a fraction, (x) the numerator of which
is equal to 6.500% minus the Net Mortgage Rate of such Mortgage Loan, and (y)
the denominator of which is equal to 0.500%.

                  Sub-Loan Group I-3 Fraction: With respect to any Mortgage Loan
in Loan Group I with a Net Mortgage Rate of greater than or equal to 6.000% per
annum and less than 6.500% per annum, a fraction, (x) the numerator of which is
equal to the Net Mortgage Rate of such Mortgage Loans minus 6.000%, and (y) the
denominator of which is equal to 0.500%.

                  Subordinate Certificates: The Group I Subordinate Certificates
and the Group II Subordinate Certificates.

                  Subordinate Certificate Writedown Amount: With respect to the
Group I Subordinate Certificates, the amount by which (x) the sum of the
Certificate Principal Balances of the Group I Certificates (after giving effect
to the distribution of principal and the allocation of Realized Losses in
reduction of the Certificate Principal Balances of the Group I Certificates on
such Distribution Date) exceeds (y) the Stated Principal Balances of the
Mortgage Loans in Loan Group I on the Due Date related to such Distribution
Date.

                  Subordinate Optimal Principal Amount: With respect to any
Sub-Loan Group of Loan Group I and each Distribution Date will be an amount
equal to the sum of the following (but in no event greater than the aggregate
Certificate Principal Balance of the Group I Subordinate Certificates
immediately prior to such Distribution Date):

                  (1) the related Subordinate Percentage of the Non-PO
         Percentage of the principal portion of all Monthly Payments due on each
         Mortgage Loan in the related Sub-Loan Group on the related Due Date, as
         specified in the amortization schedule at the time applicable thereto
          (after adjustment for previous principal prepayments but before any
         adjustment to such amortization schedule by reason of any bankruptcy or
         similar proceeding or any moratorium or similar waiver or grace
         period);

                   (2) the related Subordinate Prepayment Percentage of the
         Non-PO Percentage of the Stated Principal Balance of each Mortgage Loan
         in the related Sub-Loan Group which was the subject of a prepayment in
         full received by a Servicer during the applicable Prepayment Period;

                  (3) the related Subordinate Prepayment Percentage of the
         Non-PO Percentage of the amount all partial prepayments of principal
         received in respect of Mortgage Loans in the related Sub-Loan Group
         during the applicable Prepayment Period;

                  (4) the excess, if any, of (a) the Net Liquidation Proceeds
         allocable to principal received in respect of each Mortgage Loan in the
         related Sub-Loan Group that became a Liquidated Mortgage Loan during
         the related Liquidation Period and all Subsequent Recoveries



                                       43
<PAGE>

         received in respect of each Liquidated Mortgage Loan during the
          related Due Period over (b) the sum of the amounts distributable to
         the holders of the Group I Senior Certificates in the related
         Certificate Group pursuant to clause (4) of the definition of "Senior
         Optimal Principal Amount" and "Class I-PO Certificate Principal
         Distribution Amount" on such Distribution Date;

                  (5) the related Subordinate Prepayment Percentage of the
         Non-PO Percentage of the sum of (a) the Stated Principal Balance of
          each Mortgage Loan in the related Sub-Loan Group which was repurchased
         by the sponsor in connection with such Distribution Date and (b) the
         difference, if any, between the Stated Principal Balance of a Mortgage
         Loan in the related Sub-Loan Group that has been replaced by the
         sponsor with a substitute Mortgage Loan pursuant to the Mortgage Loan
         purchase agreement in connection with such Distribution Date and the
         Stated Principal Balance of such substitute Mortgage Loan; and

                  (6) on the Distribution Date on which the aggregate
         Certificate Principal Balance of the Group I Senior Certificates (other
         than the Class I-X and Class I-PO certificates) in the related
          Certificate Group have all been reduced to zero, 100% of the Senior
         Optimal Principal Amount for such Group I Senior Certificates.

                  Subordinate Percentage: As of any Distribution Date and with
respect to any Sub-Loan Group included in Loan Group I, equals 100% minus the
related Senior Percentage for the related Certificate Group.

                  Subordinate Prepayment Percentage: As of any Distribution Date
and with respect to any Sub-Loan Group included in Loan Group I, will equal 100%
minus the Senior Prepayment Percentage for the Senior Certificates in the
related Certificate Group.

                  Subsequent Recovery: The recovery of any amount (including the
release of surplus funds held to cover expenses) in respect of a Liquidated Loan
after a Realized Loss has been allocated with respect thereto to one or more
Classes of Certificates.

                  Subservicer: Any Person that (i) services Mortgage Loans on
behalf of any Servicer or that is engaged by the Master Servicer or Securities
Administrator, and (ii) is responsible for the performance (whether directly or
through subservicers or Subcontractors) of a substantial portion of the material
servicing functions required to be performed under this Agreement, any related
Servicing Agreement or any subservicing agreement that are identified in Item
1122(d) of Regulation AB.

                  Sub-Servicing Letter Agreement: The letter agreement, dated
March 15, 2007, among EMC, as servicer, Wells Fargo Bank, N.A., as subservicer
and the Master Servicer, providing for the allocation of certain fees and
reimbursements identified therein.

                  Substitution Adjustment Amount: The meaning ascribed to such
term pursuant to Section 2.03(c).

                   Successor Master Servicer: The meaning ascribed to such term
pursuant to Section 8.01.

                  Tax Matters Person: The person designated as "tax matters
person" in the manner provided under Treasury regulation ss. 1.860F-4(d) and
temporary Treasury regulation ss. 301.6231(a)(7)-1T. The holder of the greatest
Percentage Interest in a Class of Residual Certificates shall be the Tax Matters
Person for the related REMIC. The Securities Administrator, or any successor
thereto or assignee thereof shall serve as tax administrator hereunder and as
agent for the related Tax Matters Person.



                                       44
<PAGE>

                  Termination Costs: The costs and expenses related to the
termination of any Servicer, the appointment of a successor servicer or the
transfer and assumption of servicing with respect to the related Servicing
Agreement, including, without limitation, the items set forth in Section
3.03(c).

                  Transfer Affidavit:   As defined in Section 6.02(c).

                  Transfer: Any direct or indirect transfer or sale of any
Ownership Interest in a Certificate.

                  Trigger Event: With respect to Loan Group II and any
Distribution Date, a violation of either the Cumulative Loss Test or the
Delinquency Test.

                  Trust or Trust Fund: The corpus of the trust created hereunder
consisting of (i) the Mortgage Loans and all interest accruing and principal due
(or in the case of any Simple Interest Loan, received) with respect thereto
after the Cut-off Date to the extent not applied in computing the Cut-off Date
Principal Balance thereof; (ii) the Distribution Account, the Yield Maintenance
Account, the Final Maturity Reserve Account and the Basis Risk Reserve Fund and
all amounts deposited therein pursuant to the applicable provisions of this
Agreement; (iii) property that secured a Mortgage Loan and has been acquired by
foreclosure, deed in lieu of foreclosure or otherwise; (iv) the mortgagee's
rights under the Insurance Policies with respect to the Mortgage Loans; (v) the
Servicing Agreements and Assumption Agreements; (vi) rights under the Yield
Maintenance Agreements; and (vii) all proceeds of the foregoing, including
proceeds of conversion, voluntary or involuntary, of any of the foregoing into
cash or other liquid property.

                  Trustee: Citibank, N.A., a national banking association, not
in its individual capacity, but solely in its capacity as trustee for the
benefit of the Certificateholders under this Agreement, and any successor
thereto, and any corporation or national banking association resulting from or
surviving any consolidation or merger to which it or its successors may be a
party and any successor trustee as may from time to time be serving as successor
trustee hereunder.

                  Trustee Fee: As to any Distribution Date, a fee payable to the
Trustee by the Master Servicer out of its own funds in such amount as they may
separately agree.

                  Unpaid Applied Realized Loss Amount: As of any Distribution
Date, and each Class of Group II Offered Certificates, the excess of (i) the
Applied Realized Loss Amount for such Class over (ii) the sum of all
distributions on such Class in reduction of the Applied Realized Loss Amount and
any Subsequent Recoveries allocated to such Class, in each case, on all previous
Distribution Dates.

                  Voting Rights: The portion of the voting rights of all the
Certificates that is allocated to any Certificate for purposes of the voting
provisions hereunder. Voting Rights shall be allocated (i) 96% to the
Certificates (other than the Class I-X Certificates, Class P Certificates, Class
B-IO Certificates and the Residual Certificates), (ii) 1% to the Class I-X
Certificates, (iii) 1% to the Class P Certificates, (iv) 1% to the Class B-IO
Certificates, and (v) 1% to the Residual Certificates, with the allocation among
the Certificates to be in proportion to the Certificate Principal Balance of
each Class relative to the Certificate Principal Balance of all other such
Classes. Voting Rights will be allocated among the Certificates of each Class of
Certificates, in accordance with their respective Percentage Interests.

                  WFB: Wells Fargo Bank, N.A., in its capacity as a Servicer of
the Mortgage Loans and its successor and assigns in such capacity.



                                       45
<PAGE>

                  Yield Maintenance Account: The separate Eligible Account
created and maintained by the Paying Agent pursuant to Section 4.06 in the name
of the Trustee primarily for the benefit of the Holders of the Adjustable Rate
Certificates and designated "Citibank, N.A., in trust for registered holders of
the Bear Stearns Asset Backed Securities Trust 2007-SD2, Asset-Backed
Certificates, Series 2007-SD2." The Yield Maintenance Account shall not
constitute an asset of any REMIC hereunder.

                  Yield Maintenance Agreements: With respect to the Adjustable
Rate Certificates, the respective yield maintenance agreements with reference
numbers FXNCC9305, FXNCC9306, FXNCC9307, FXNCC9308, FXNCC9309 and FXNCC93012,
each dated as of March 15, 2007, between the Yield Maintenance Provider and the
Trustee on behalf of the Trust, together with any scheduling, confirmations or
other agreements related thereto, attached hereto as Exhibit N.

                  Yield Maintenance Payment: (i) With respect to the Yield
Maintenance Agreement related to the Class II-A Certificates and any
Distribution Date through the Distribution Date in January 2012, an amount equal
to the product of (A) the actual number of days in the applicable Accrual Period
divided by 360, and (B) the product of (a) the per annum rate equal to the
excess, if any, of (x) the lesser of (i) One-Month LIBOR and (ii) 11.50% per
annum, over (y) the applicable Strike Rate and (b) the lesser of (x) the
aggregate Certificate Principal Balance of the Class II-A Certificates and (y)
the Projected Principal Balance for such Certificates, in each case for such
Distribution Date.

                   (ii) With respect to the Yield Maintenance Agreements related
to each Class of Class II-M Certificates and any Distribution Date through the
Distribution Date in January 2012, the amount equal to the product of (A) the
actual number of days in the applicable Accrual Period divided by 360, and (B)
the product of (a) the per annum rate equal to the excess, if any, of (x) the
lesser of (i) One-Month LIBOR and (ii) 11.50% per annum, over (y) the applicable
Strike Rate and (b) the lesser of (x) the Certificate Principal Balance of the
related Class of Class II-M Certificates and (y) the Projected Principal Balance
for such Class of Certificates, in each case for such Distribution Date.

                  Yield Maintenance Provider: Bear Stearns Financial Products
Inc. or any successor in interest.


                                       46
<PAGE>


                                  ARTICLE II.

                            CONVEYANCE OF TRUST FUND
                         REPRESENTATIONS AND WARRANTIES

         Section 2.01.      Conveyance of Trust Fund.

                  The Sponsor hereby sells, transfers, assigns, sets over and
otherwise conveys to the Depositor, without recourse, all the right, title and
interest of the Sponsor in and to the assets in the Trust Fund.

                  The Sponsor has entered into this Agreement in consideration
for the purchase of the Mortgage Loans by the Depositor and has agreed to take
the actions specified herein.

                  The Depositor, concurrently with the execution and delivery
hereof, hereby sells, transfers, assigns, sets over and otherwise conveys to the
Trustee for the use and benefit of the Certificateholders, without recourse, all
the right, title and interest of the Depositor in and to the Trust Fund.

                  In connection with any such transfer and assignment, the
Depositor has delivered to or caused to be delivered to, and deposited with, the
Custodian the following documents or instruments with respect to each Mortgage
Loan so assigned:

                  (i) the original Mortgage Note, including any riders thereto,
         endorsed without recourse (A) to the order of "Citibank, N.A., as
         Trustee for certificateholders, of Bear Stearns Asset Backed Securities
          Trust 2007-SD2, Asset Backed Certificates, Series 2007-SD2, without
         recourse", or in blank, or (B) in the case of a Mortgage Loan
         registered on the MERS(R) System, in blank and, in each case, showing
         to the extent available to the Sponsor an unbroken chain of
         endorsements from the original payee thereof to the Person endorsing it
         to the Trustee,

                  (ii) the original Mortgage and, if the related Mortgage Loan
         is a MOM Loan, noting the presence of the MIN and language indicating
         that such Mortgage Loan is a MOM Loan, which shall have been recorded
         (or if the original is not available, a copy), with evidence of such
         recording indicated thereon (or if clause (x) in the proviso below
         applies, shall be in recordable form),

                  (iii) unless the Mortgage Loan is registered on the MERS(R)
         System, the assignment (either an original or a copy, which may be in
         the form of a blanket assignment if permitted in the jurisdiction in
         which the Mortgaged Property is located) to the Trustee of the
         Mortgage, in recordable form, with respect to each Mortgage Loan in the
         name of "Citibank, N.A., as Trustee for certificateholders of Bear
         Stearns Asset Backed Securities Trust 2007-SD2, Asset Backed
         Certificates, Series 2007-SD2" or in blank,

                  (iv) an original or a copy of all intervening assignments of
         the Mortgage, if any, to the extent available to the Sponsor , with
         evidence of recording thereon,

                  (v) the original policy of title insurance or mortgagee's
         certificate of title insurance or commitment or binder for title
         insurance, if available, or a copy thereof, or, in the event that such
         original title insurance policy is unavailable, a photocopy thereof, or
         in lieu thereof, a current lien search on the related Mortgaged
         Property and



                                        47
<PAGE>

                  (vi) originals or copies of all available assumption,
         modification or substitution agreements, if any;

                  provided, however, that the assignment of the Mortgage to the
Trustee will not be required to be submitted for recording with respect to any
Mortgage Loan: (a) if the Trustee and the Custodian shall have received an
Opinion of Counsel addressed to the Trustee to the effect that the recordation
of the assignment to the Trustee of the Mortgage securing a particular Mortgage
Note is not necessary to perfect the security interest of the Trustee in such
Mortgage, (b) such recordation is not required by the Rating Agencies or (c) if
MERS is identified on the Mortgage or on a properly recorded assignment of the
Mortgage as the mortgagee of record solely as nominee for the Sponsor and its
successors and assigns;

                  and provided, further, however, that in lieu of the foregoing,
the Depositor may deliver, or cause to be delivered, the following documents,
under the circumstances set forth below: (x) if any Mortgage, assignment thereof
to the Trustee or intervening assignments thereof have been delivered or are
being delivered to recording offices for recording and have not been returned in
time to permit their delivery as specified above, the Depositor may deliver, or
cause to be delivered, a true copy thereof with a certification by the
applicable Servicer or the title company issuing the commitment for title
insurance, on the face of such copy, substantially as follows: "Certified to be
a true and correct copy of the original, which has been transmitted for
recording"; and (y) in lieu of the Mortgage Notes relating to the Mortgage Loans
identified in the list set forth in Exhibit J, the Depositor may deliver, or
cause to be delivered, a lost note affidavit (or a blanket lost note affidavit
covering some or all of the Mortgage Loans in Exhibit J) and a copy of the
original note, if available; and provided, further, however, that in the case of
Mortgage Loans which have been prepaid in full after the Cut-off Date and prior
to the Closing Date, the Depositor, in lieu of delivering the above documents,
may cause the Sponsor to, and the Sponsor shall, (i) deposit or cause to be
deposited on the Closing Date all amounts paid in respect of such Mortgage Loans
(to the extent required to be remitted by the related Servicers pursuant to
their Servicing Agreements) into the Distribution Account or (ii) deliver to the
Custodian on the Closing Date a certification of an authorized officer of the
Sponsor stating that the Sponsor will deposit or cause to be deposited all such
amounts on or before Business Day immediately preceding the first Distribution
Date, in which case the Sponsor shall so deposit or cause to be deposited such
amounts into the Distribution Account on or before such Business Day immediately
preceding the first Distribution Date.

                  In the case of the documents referred to in clause (x) above,
the Depositor shall deliver, or cause to be delivered, such documents to the
Custodian promptly after they are received. The Sponsor shall cause, at its
expense, the Mortgage and intervening assignments, if any, and to the extent
required in accordance with the foregoing, the assignment of the Mortgage to the
Trustee to be submitted for recording promptly after the Closing Date. In the
event that the Sponsor, the Depositor or the Master Servicer gives written
notice to the Trustee (a) that recording of the assignment of the Mortgage to
the Trustee is required to protect the right, title and interest of the Trustee
on behalf of the Certificateholders in and to any Mortgage Loan, (b) a court
recharacterizes the sale of the Mortgage Loans as a financing, or (c) as a
result of any change in or amendment to the laws of a State in which recording
was not effected or any applicable political subdivision thereof, or any change
in official position regarding application or interpretation of such laws,
including a holding by a court of competent jurisdiction, such recording is so
required, the Sponsor shall submit or cause to be submitted for recording as
specified above or, should the Sponsor fail to perform such obligations, the
Trustee (or the Custodian on its behalf) shall cause each such previously
unrecorded assignment to be submitted for recording as specified above at the
expense of the Trust pursuant to Section 9.05. In the event a Mortgage File is
released to the Master Servicer or a Servicer as a result of the Master
Servicer's or a Servicer's having completed a Request for Release, the Trustee
shall, if not so completed, complete, or cause the Custodian to complete, the
assignment of the related Mortgage in the manner specified in clause (iii)
above.



                                        48
<PAGE>

                  In connection with the assignment of any Mortgage Loans
registered on the MERS(R) System, the Sponsor further agrees that it will cause,
at the Sponsor's own expense, within 30 days after the Closing Date, the MERS(R)
System to indicate that such Mortgage Loans have been assigned by the Sponsor to
the Depositor and by the Depositor to the Trustee in accordance with this
Agreement for the benefit of the Certificateholders by including (or deleting,
in the case of Mortgage Loans which are repurchased in accordance with this
Agreement) in such computer files (a) the code in the field which identifies the
specific Trustee, (b) the code in the field "Pool Field" which identifies the
series of the Certificates issued in connection with such Mortgage Loans and (c)
a code that provides the Custodian with access to such Mortgage Loans. The
Sponsor further agrees that it will not, and will not permit any Servicer or the
Master Servicer to, and the Master Servicer agrees that it will not, alter the
codes referenced in this paragraph with respect to any Mortgage Loan during the
term of this Agreement unless and until such Mortgage Loan is repurchased in
accordance with the terms of this Agreement.

                  Since the mortgage loans permitted to be purchased pursuant to
this Agreement are limited to (i) the Mortgage Loans purchased hereunder on the
Closing Date and (ii) any Replacement Mortgage Loans purchased hereafter
pursuant to the provisions of this Agreement, and the Sponsor has made the
representations and warranties contained herein with respect to all such
Mortgage Loans, including the representations and warranties contained in
Section 2.03(b)(vii)(Q) and (S) of this Agreement, that, as of the Closing Date
or date of substitution, as applicable, no Mortgage Loan is a "high cost home",
"covered", "high risk home" or "predatory" loan under any applicable federal,
state or local law,, it is agreed and understood by the Depositor, the Sponsor
and the Trustee that it is not intended that any mortgage loan be purchased
hereunder that is a "High-Cost Home Loan" as defined in the New Jersey Home
Ownership Security Act of 2002, a "High-Cost Home Loan" as defined in the New
Mexico Home Loan Protection Act, a "High Cost Home Mortgage Loan" as defined in
the Massachusetts Predatory Home Loan Practices Act of 2004 or a "High-Cost Home
Loan" as defined in the Indiana High Cost Home Loan Law of 2005.

         Section 2.02.      Acceptance of the Mortgage Loans.

                   (a) The Trustee acknowledges receipt based on receipt by the
Custodian of, subject to the further review and the exceptions the Custodian
notes pursuant to the procedures described below, the documents (or certified
copies thereof) delivered to the Custodian pursuant to Section 2.01 and declares
that it holds and will continue to hold directly or through the Custodian those
documents and any amendments, replacements or supplements thereto and all other
assets of the Trust Fund delivered to the Custodian on its behalf in trust for
the use and benefit of all present and future Holders of the Certificates. On
the Closing Date, the Custodian will deliver to the Sponsor, the Depositor and
the Trustee an initial certification in the form annexed as Exhibit One to the
Custodial Agreement confirming whether or not it has received the Mortgage File
for each Mortgage Loan, but without review of such Mortgage File, except to the
extent necessary to confirm whether such Mortgage File contains the original
Mortgage Note or a lost note affidavit in lieu thereof. No later than 90 days
after the Closing Date, the Custodian agrees pursuant to the Custodial
Agreement, for the benefit of the Certificateholders, to review each Mortgage
File delivered to it and to execute and deliver, or cause to be executed and
delivered, to the Sponsor, the Depositor and to the Trustee an interim
certification substantially in the form annexed as Exhibit Two to the Custodial
Agreement. In conducting such review, the Custodian on behalf of the Trustee
will ascertain whether all required documents have been executed and received
and whether those documents relate, determined on the basis of the Mortgagor
name, original principal balance and loan number, to the Mortgage Loans
identified in Exhibit B to this Agreement, as supplemented (provided, however,
that with respect to those documents described in clauses (iv) and (vi) of the
fourth paragraph of Section 2.01, such obligations shall extend only to
documents actually delivered pursuant to such clauses). In performing any such
review, the Custodian on behalf of the Trustee and in accordance with the
Custodial Agreement may conclusively rely on the purported due execution and
genuineness of any



                                       49
<PAGE>

such document and on the purported genuineness of any signature thereon. If the
Custodian finds any document constituting part of the Mortgage File not to have
been executed or received, or to be unrelated to the Mortgage Loans identified
in Exhibit B or to appear to be defective on its face, the Custodian shall
include such information in the exception report attached to such interim
certification. The Sponsor shall correct or cure any such defect or, if prior to
the end of the second anniversary of the Closing Date, the Sponsor may
substitute for the related Mortgage Loan a Replacement Mortgage Loan, which
substitution shall be accomplished in the manner and subject to the conditions
set forth in Section 2.03 or shall deliver to the Trustee and the Custodian an
Opinion of Counsel, addressed to the Trustee and the Custodian, at the Sponsor's
expense, to the effect that such defect does not materially or adversely affect
the interests of Certificateholders in such Mortgage Loan within 90 days from
the date of notice from the Custodian of the defect and if the Sponsor fails to
correct or cure the defect or deliver such opinion within such period, the
Sponsor will, subject to Section 2.03, within 90 days from the notification of
the Custodian purchase such Mortgage Loan at the Purchase Price; provided,
however, that if such defect relates solely to the inability of the Sponsor to
deliver the Mortgage, assignment thereof to the Trustee, or intervening
assignments thereof with evidence of recording thereon because such documents
have been submitted for recording and have not been returned by the applicable
jurisdiction, the Sponsor shall not be required to purchase such Mortgage Loan
if the Sponsor delivers such documents promptly upon receipt, but in no event
later than 360 days after the Closing Date.

                  (b) No later than 180 days after the Closing Date, the
Custodian on behalf of the Trustee and in accordance with the Custodial
Agreement will review, for the benefit of the Certificateholders, the Mortgage
Files and will execute and deliver or cause to be executed and delivered to the
Sponsor, the Depositor and to the Trustee, a final certification substantially
in the form annexed as Exhibit Three to the Custodial Agreement. In conducting
such review, the Custodian will ascertain whether each document required to be
recorded has been returned from the recording office with evidence of recording
thereon and the Custodian has received either an original or a copy thereof, as
required in Section 2.01 (provided, however, that with respect to those
documents described in clauses (iv) and (vi) of the fourth paragraph of Section
2.01, such obligations shall extend only to documents actually delivered
pursuant to such clauses). If the Custodian finds any document with respect to a
Mortgage Loan has not been received, or to be unrelated, determined on the basis
of the Mortgagor name, original principal balance and loan number, to the
Mortgage Loans identified in Exhibit B or to appear defective on its face, the
Custodian shall note such defect in the exception report attached to the final
certification and shall promptly notify the Sponsor. The Sponsor shall correct
or cure any such defect or, if prior to the end of the second anniversary of the
Closing Date, the Sponsor may substitute for the related Mortgage Loan a
Replacement Mortgage Loan, which substitution shall be accomplished in the
manner and subject to the conditions set forth in Section 2.03 or shall deliver
to the Trustee and the Custodian an Opinion of Counsel, addressed to the Trustee
and the Custodian, at the Sponsor's expense, to the effect that such defect does
not materially or adversely affect the interests of Certificateholders in such
Mortgage Loan within 90 days from the date of notice from the Custodian of the
defect and if the Sponsor is unable within such period to correct or cure such
defect, or to substitute the related Mortgage Loan with a Replacement Mortgage
Loan or to deliver such opinion, the Sponsor shall, subject to Section 2.03,
within 90 days from the notification of the Custodian, purchase such Mortgage
Loan at the Purchase Price; provided, however, that if such defect relates
solely to the inability of the Sponsor to deliver the Mortgage, assignment
thereof to the Trustee or intervening assignments thereof with evidence of
recording thereon, because such documents have not been returned by the
applicable jurisdiction, the Sponsor shall not be required to purchase such
Mortgage Loan, if the Sponsor delivers such documents promptly upon receipt, but
in no event later than 360 days after the Closing Date.

                  (c) In the event that a Mortgage Loan is purchased by the
Sponsor in accordance with subsections 2.02(a) or (b) above or Section 2.03, the
Sponsor shall remit the applicable Purchase Price to the Paying Agent for
deposit in the Distribution Account and shall provide written notice to the


                                       50
<PAGE>

Paying Agent and Trustee detailing the components of the Purchase Price, signed
by a Servicing Officer. Upon deposit of the Purchase Price in the Distribution
Account and receipt of a Request for Release, the Trustee will release or notify
the Custodian which, upon receipt of such notice from the Trustee, shall release
to the Sponsor the related Mortgage File and the Trustee shall execute and
deliver all instruments of transfer or assignment, without recourse,
representation or warranty, furnished to it by the Sponsor, as are necessary to
vest in the Sponsor title to and rights under the Mortgage Loan. Such purchase
shall be deemed to have occurred on the date on which the deposit into the
Distribution Account was made or if the Custodian is then acting, the date on
which notice of the deposit of the Purchase Price into the Distribution Account
was received by the Custodian from the Securities Administrator or Paying Agent.
The Trustee shall promptly notify the Rating Agencies of such repurchase. The
obligation of the Sponsor to cure, repurchase or substitute for any Mortgage
Loan as to which a defect in a constituent document exists shall be the sole
remedy respecting such defect available to the Certificateholders or to the
Trustee on their behalf.

                  (d) The Sponsor shall deliver to the Custodian, and the
Trustee agrees to accept or to cause the Custodian to accept, the Mortgage Note
and other documents constituting the Mortgage File with respect to any
Replacement Mortgage Loan, which the Custodian will review as provided in
subsections 2.02(a) and 2.02(b), provided, that the Closing Date referred to
therein shall instead be the date of delivery of the Mortgage File with respect
to each Replacement Mortgage Loan.

                  (e) Until all amounts distributable in respect of the
Certificates have been distributed in full and the Master Servicer has otherwise
fulfilled its respective obligations under this Agreement, the Trustee, or the
Custodian acting on its behalf, shall retain possession and custody of each
Mortgage File in accordance with and subject to the terms and conditions of this
Agreement.

         Section 2.03.      Representations, Warranties and Covenants of the
                           Master Servicer and the Sponsor.

                  (a) The Master Servicer hereby represents and warrants to the
Depositor, the Securities Administrator and the Trustee as follows, as of the
Closing Date:

                  (i)       It is duly organized and is validly existing and in
         good standing as a national banking association organized under the
          laws of the United States, and is duly authorized and qualified to
         transact any and all business contemplated by this Agreement to be
         conducted by it in any state in which a Mortgaged Property is located
         or is otherwise not required under applicable law to effect such
         qualification and, in any event, is in compliance with the doing
         business laws of any such state, to the extent necessary to ensure its
         ability to enforce each Mortgage Loan, to service the Mortgage Loans in
         accordance with the terms of this Agreement and to perform any of its
         other obligations under this Agreement in accordance with the terms
         hereof.

                  (ii)      It has the full corporate power and authority to
         service each Mortgage Loan, and to execute, deliver and perform, and to
         enter into and consummate the transactions contemplated by this
         Agreement and has duly authorized by all necessary corporate action on
          its part the execution, delivery and performance of this Agreement; and
         this Agreement, assuming the due authorization, execution and delivery
         hereof by the other parties hereto, constitutes its legal, valid and
         binding obligation, enforceable against it in accordance with its
         terms, except that (a) the enforceability hereof may be limited by
         bankruptcy, insolvency, moratorium, receivership and other similar laws
         relating to creditors' rights generally and (b) the remedy of specific
         performance and injunctive and other forms of equitable relief may be
         subject to equitable defenses and to the discretion of the court before
         which any proceeding therefor may be brought.



                                        51
<PAGE>

                  (iii)     The execution and delivery of this Agreement by it,
         the servicing of the Mortgage Loans by it under this Agreement, the
         consummation of any other of the transactions contemplated by this
         Agreement, and the fulfillment of or compliance with the terms hereof
         are in its ordinary course of business and will not (A) result in a
         material breach of any term or provision of its charter or by-laws or
         (B) materially conflict with, result in a material breach, violation or
         acceleration of, or result in a material default under, the terms of
         any other material agreement or instrument to which it is a party or by
         which it may be bound, or (C) constitute a material violation of any
         statute, order or regulation applicable to it of any court, regulatory
         body, administrative agency or governmental body having jurisdiction
         over it; and it is not in breach or violation of any material indenture
         or other material agreement or instrument, or in violation of any
         statute, order or regulation of any court, regulatory body,
         administrative agency or governmental body having jurisdiction over it
         which breach or violation may materially impair its ability to perform
         or meet any of its obligations under this Agreement.

                  (iv)      It or one or more of its affiliates is an approved
         servicer of conventional mortgage loans for Fannie Mae or Freddie Mac
         and is a mortgagee approved by the Secretary of Housing and Urban
         Development pursuant to sections 203 and 211 of the National Housing
         Act.

                  (v)       No litigation is pending or, to the best of its
         knowledge, threatened, against it that would materially and adversely
         affect the execution, delivery or enforceability of this Agreement or
         its ability to service the Mortgage Loans or to perform any of its
         other obligations under this Agreement in accordance with the terms
         hereof.

                  (vi)      No consent, approval, authorization or order of any
         court or governmental agency or body is required for its execution,
         delivery and performance of, or compliance with, this Agreement or the
         consummation of the transactions contemplated hereby, or if any such
         consent, approval, authorization or order is required, it has obtained
         the same.

                  (b) The Sponsor hereby represents and warrants to the
Depositor, the Securities Administrator, the Master Servicer and the Trustee as
follows, as of the Closing Date:

                  (i)       The Sponsor is duly organized as a Delaware
         corporation and is validly existing and in good standing under the laws
         of the State of Delaware and is duly authorized and qualified to
         transact any and all business contemplated by this Agreement to be
         conducted by the Sponsor in any state in which a Mortgaged Property is
         located or is otherwise not required under applicable law to effect
         such qualification and, in any event, is in compliance with the doing
         business laws of any such state, to the extent necessary to ensure its
         ability to enforce each Mortgage Loan, to sell the Mortgage Loans in
         accordance with the terms of this Agreement and to perform any of its
         other obligations under this Agreement in accordance with the terms
         hereof.

                  (ii)      The Sponsor has the full corporate power and
         authority to sell each Mortgage Loan, and to execute, deliver and
         perform, and to enter into and consummate the transactions contemplated
         by this Agreement and has duly authorized by all necessary corporate
         action on the part of the Sponsor the execution, delivery and
         performance of this Agreement; and this Agreement, assuming the due
         authorization, execution and delivery hereof by the other parties
         hereto, constitutes a legal, valid and binding obligation of the
         Sponsor, enforceable against the Sponsor in accordance with its terms,
         except that (a) the enforceability hereof may be limited by bankruptcy,
         insolvency, moratorium, receivership and other similar laws relating to
         creditors' rights generally and (b) the remedy of specific performance
         and injunctive and other forms of equitable relief may be subject to
         equitable defenses and to the discretion of the court before which any
         proceeding therefor may be brought.



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                  (iii)     The execution and delivery of this Agreement by the
         Sponsor, the sale of the Mortgage Loans by the Sponsor under this
         Agreement, the consummation of any other of the transactions
         contemplated by this Agreement, and the fulfillment of or compliance
         with the terms hereof are in the ordinary course of business of the
         Sponsor and will not (A) result in a material breach of any term or
         provision of the charter or by-laws of the Sponsor or (B) materially
         conflict with, result in a material breach, violation or acceleration
         of, or result in a material default under, the terms of any other
         material agreement or instrument to which the Sponsor is a party or by
         which it may be bound, or (C) constitute a material violation of any
         statute, order or regulation applicable to the Sponsor of any court,
         regulatory body, administrative agency or governmental body having
         jurisdiction over the Sponsor; and the Sponsor is not in breach or
         violation of any material indenture or other material agreement or
         instrument, or in violation of any statute, order or regulation of any
         court, regulatory body, administrative agency or governmental body
          having jurisdiction over it which breach or violation may materially
         impair the Sponsor's ability to perform or meet any of its obligations
         under this Agreement.

                  (iv)      The Sponsor is an approved seller of conventional
         mortgage loans for Fannie Mae or Freddie Mac and is a mortgagee
         approved by the Secretary of Housing and Urban Development pursuant to
         sections 203 and 211 of the National Housing Act.

                  (v)       No litigation is pending or, to the best of the
         Sponsor's knowledge, threatened, against the Sponsor that would
         materially and adversely affect the execution, delivery or
         enforceability of this Agreement or the ability of the Sponsor to sell
         the Mortgage Loans or to perform any of its other obligations under
         this Agreement in accordance with the terms hereof.

                  (vi)      No consent, approval, authorization or order of any
         court or governmental agency or body is required for the execution,
         delivery and performance by the Sponsor of, or compliance by the
         Sponsor with, this Agreement or the consummation of the transactions
         contemplated hereby, or if any such consent, approval, authorization or
         order is required, the Sponsor has obtained the same.

                  (vii)     With respect to each Mortgage Loan as of the Closing
         Date (unless otherwise expressly provided):

                           A.    the information set forth in the Mortgage Loan
              Schedule hereto is true and correct in all material respects;

                           B.    immediately prior to the transfer to the
              Depositor, the Sponsor was the sole owner of beneficial title and
              holder of each Mortgage and Mortgage Note relating to the Mortgage
              Loans and is conveying the same free and clear of any and all
              liens, claims, encumbrances, participation interests, equities,
               pledges, charges or security interests of any nature and the
              Sponsor has full right and authority to sell or assign the same
              pursuant to this Agreement;

                           C.    each Mortgage Loan at the time it was made
              complied in all material respects with all applicable laws and
              regulations, including, without limitation, usury, equal credit
              opportunity, disclosure and recording laws and all applicable
              predatory, abusive and fair lending laws; and each Mortgage Loan
              has been serviced in all material respects in accordance with all
              applicable laws and regulations, including, without limitation,
              usury, equal credit opportunity, disclosure and recording laws and
              all applicable anti-predatory lending laws and the terms of the
              related Mortgage Note, the Mortgage and other loan documents;



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                            D.    there is no monetary default existing under any
              Mortgage or the related Mortgage Note and there is no material
              event which, with the passage of time or with notice and the
              expiration of any grace or cure period, would constitute a
              default, breach or event of acceleration; and neither the Sponsor,
              any of its affiliates nor any servicer of any related Mortgage
              Loan has taken any action to waive any default, breach or event of
              acceleration; and no foreclosure action is threatened or has been
              commenced with respect to the Mortgage Loan;

                           E.    the terms of the Mortgage Note and the Mortgage
               have not been impaired, waived, altered or modified in any
              respect, except by written instruments which have been recorded or
              will be recorded, if necessary, (i) if required by law in the
              jurisdiction where the Mortgaged Property is located, or (ii) to
              protect the interests of the Trustee on behalf of the
              Certificateholders;

                           F.    no selection procedure reasonably believed by
              the Sponsor to be adverse to the interests of the
              Certificateholders was utilized in selecting the Mortgage Loans;

                           G.    each Mortgage is a valid and enforceable first
              on the property securing the related Mortgage Note and each
              Mortgaged Property is owned by the Mortgagor in fee simple (except
              with respect to common areas in the case of condominiums, PUDs and
              de minimis PUDs) or by leasehold for a term longer than the term
              of the related Mortgage, subject only to (i) the lien of current
              real property taxes and assessments, (ii) covenants, conditions
              and restrictions, rights of way, easements and other matters of
              public record as of the date of recording of such Mortgage, such
              exceptions being acceptable to mortgage lending institutions
              generally or specifically reflected in the appraisal obtained in
              connection with the origination of the related Mortgage Loan or
              referred to in the lender's title insurance policy delivered to
              the originator of the related Mortgage Loan and (iii) other
              matters to which like properties are commonly subject which do not
              materially interfere with the benefits of the security intended to
              be provided by such Mortgage;

                           H.    there is no mechanics' lien or claim for work,
           &nbs