ASSIGNMENT AND ASSUMPTION AGREEMENT

                                   ASSIGNMENT AND ASSUMPTION AGREEMENT

                  ASSIGNMENT AND  ASSUMPTION  AGREEMENT,  dated  September 28, 2006,  between  Residential

Funding  Corporation,  a  StateDelaware  corporation  (“RFC”),  and Residential  Accredit  Loans,  Inc., a

StateplaceDelaware corporation (the “Company”).

                                                 Recitals

                  A. RFC has entered into contracts  (“Seller  Contracts”) with various  seller/servicers,

pursuant to which such seller/servicers sell to RFC mortgage loans.

                  B. The  Company  wishes to  purchase  from RFC certain  Mortgage  Loans (as  hereinafter

defined) sold to RFC pursuant to the Seller Contracts.

                  C. The Company,  RFC, as master servicer,  and Deutsche Bank Trust Company Americas,  as

trustee  (the  “Trustee”),  are  entering  into a Series  Supplement,  dated as of  September 1, 2006 (the

“Series  Supplement”),  and the Standard  Terms of Pooling and Servicing  Agreement,  dated as of March 1,

2006  (collectively,  the “Pooling and Servicing  Agreement”),  pursuant to which the Company  proposes to

issue Mortgage Asset-Backed Pass-Through  Certificates,  Series 2006-QS13 (the “Certificates”)  consisting

of nineteen classes  designated as Class I-A-1,  Class I-A-2, Class I-A-3, Class I-A-4, Class I-A-5, Class

I-A-6,  Class I-A-7,  Class I-A-8,  Class I-A-9,  Class I-A-10,  Class I-A-11,  Class I-A-P,  Class I-A-V,

Class II-A-1, Class II-A-P,  Class II-A-V, Class R-I, Class R-II and Class R-III Certificates;  and twelve

classes designated as Class I-M-1,  Class I-M-2, Class I-M-3, Class II-M-1,  Class II-M-2 and Class II-M-3

(collectively the “Class M Certificates”),  Class I-B-1,  Class I-B-2,  Class I-B-3,  Class II-B-1,  Class

II-B-2 and Class II-B-3  Certificates  (collectively the “Class B Certificates”)  representing  beneficial

ownership  interests  in a trust fund  consisting  primarily  of a pool of mortgage  loans  identified  in

Exhibit One to the Series Supplement (the “Mortgage Loans”).

                  D. In  connection  with the purchase of the Mortgage  Loans,  the Company will assign to

RFC the Class I-A-P  Certificates,  the Class I-A-V  Certificates,  the Class II-A-P  Certificates and the

Class  II-A-V  Certificates  and a de minimis  portion of each of the Class R-I  Certificates,  Class R-II

Certificates and Class R-III Certificates.

                  E. In  connection  with the  purchase  of the  Mortgage  Loans and the  issuance  of the

Certificates, RFC wishes to make certain representations and warranties to the Company.

                  F. The  Company  and RFC intend  that the  conveyance  by RFC to the  Company of all its

right,  title and interest in and to the Mortgage  Loans  pursuant to this  Agreement  shall  constitute a

purchase and sale and not a loan.

                  NOW  THEREFORE,  in  consideration  of the recitals and the mutual  promises  herein and

other good and valuable consideration, the parties agree as follows:

                  1. All  capitalized  terms used but not defined herein shall have the meanings  assigned

thereto in the Pooling and Servicing Agreement.

                  2.  Concurrently  with the  execution  and delivery  hereof,  RFC hereby  assigns to the

Company  without  recourse all of its right,  title and interest in and to the Mortgage  Loans,  including

all  interest and  principal,  and with respect to the Sharia  Mortgage  Loans,  all amounts in respect of

profit  payments  and  acquisition  payments,  received  on or with  respect to the  Mortgage  Loans after

September  1, 2006  (other  than  payments  of  principal  and  interest,  and with  respect to the Sharia

Mortgage Loans,  all amounts in respect of profit  payments and  acquisition  payments due on the Mortgage

Loans on or before  September 30, 2006). In  consideration  of such  assignment,  RFC or its designee will

receive from the Company in immediately  available  funds an amount equal to $  639,576,858.06,  the Class

I-A-P  Certificates,  the Class  I-A-V  Certificates,  the Class  II-A-P  Certificates,  the Class  II-A-V

Certificates and a de minimis portion of each of the Class R-I  Certificates,  Class R-II Certificates and

Class R-III  Certificates.  In connection  with such  assignment and at the Company’s  direction,  RFC has

in respect of each  Mortgage Loan  endorsed the related  Mortgage Note (other than any Destroyed  Mortgage

Note) to the order of the Trustee and  delivered  an  assignment  of mortgage or security  instrument,  as

applicable, in recordable form to the Trustee or its agent.

         RFC and the Company  agree that the sale of each Pledged  Asset Loan  pursuant to this  Agreement

will also constitute the assignment,  sale, setting-over,  transfer and conveyance to the Company, without

recourse (but subject to RFC’s covenants,  representations and warranties  specifically  provided herein),

of all of RFC’s  obligations  and all of RFC’s right,  title and  interest  in, to and under,  whether now

existing or  hereafter  acquired as owner of such  Pledged  Asset Loan with  respect to any and all money,

securities,  security  entitlements,  accounts,  general intangibles,  payment  intangibles,  instruments,

documents,  deposit  accounts,  certificates  of  deposit,  commodities  contracts,  and other  investment

property and other  property of whatever kind or description  consisting of, arising from or related,  (i)

the Credit  Support  Pledge  Agreement,  the Funding and Pledge  Agreement  among the  Mortgagor  or other

Person  pledging  the related  Pledged  Assets (the  “Customer”),  Combined  Collateral  LLC and  National

Financial  Services   Corporation,   and  the  Additional   Collateral  Agreement  between  GMAC  Mortgage

Corporation  and the  Customer  (collectively,  the  “Assigned  Contracts”),  (ii) all rights,  powers and

remedies of RFC as owner of such Pledged  Asset Loan under or in connection  with the Assigned  Contracts,

whether  arising  under  the  terms of such  Assigned  Contracts,  by  statute,  at law or in  equity,  or

otherwise  arising  out of  any  default  by the  Mortgagor  under  or in  connection  with  the  Assigned

Contracts,  including  all  rights  to  exercise  any  election  or  option  or to make  any  decision  or

determination  or to give or  receive  any  notice,  consent,  approval  or waiver  thereunder,  (iii) the

Pledged Amounts and all money, securities, security entitlements,  accounts, general intangibles,  payment

intangibles,  instruments,  documents,  deposit accounts,  certificates of deposit, commodities contracts,

and other  investment  property  and other  property  of  whatever  kind or  description  and all cash and

non-cash proceeds of the sale, exchange,  or redemption of, and all stock or conversion rights,  rights to

subscribe,  liquidation  dividends  or  preferences,  stock  dividends,  rights  to  interest,  dividends,

earnings,  income,  rents,  issues,  profits,  interest  payments or other  distributions of cash or other

property  that  secures a Pledged  Asset  Loan,  (iv) all  documents,  books and  records  concerning  the

foregoing  (including  all  computer  programs,  tapes,  disks  and  related  items  containing  any  such

information)  and (v) all  insurance  proceeds  (including  proceeds  from the Federal  Deposit  Insurance

Corporation or the Securities  Investor  Protection  Corporation or any other insurance company) of any of

the  foregoing  or  replacements  thereof  or  substitutions  therefor,   proceeds  of  proceeds  and  the

conversion,  voluntary or  involuntary,  of any thereof.  The foregoing  transfer,  sale,  assignment  and

conveyance  does not  constitute  and is not intended to result in the  creation,  or an assumption by the

Company,  of any  obligation  of RFC, or any other Person in connection  with the Pledged  Assets or under

any agreement or instrument  relating  thereto,  including any obligation to the Mortgagor,  other than as

owner of the Pledged Asset Loan.

         The  Company  and RFC intend that the  conveyance  by RFC to the Company of all its right,  title

and interest in and to the  Mortgage  Loans  pursuant to this  Section 2 shall be, and be construed  as, a

sale of the Mortgage Loans by RFC to the Company.  It is,  further,  not intended that such  conveyance be

deemed to be a pledge of the  Mortgage  Loans by RFC to the  Company to secure a debt or other  obligation

of RFC.  Nonetheless,  (a) this Agreement is intended to be and hereby is a security  agreement within the

meaning of Articles 8 and 9 of the Minnesota  Uniform  Commercial Code and the Uniform  Commercial Code of

any other  applicable  jurisdiction;  (b) the  conveyance  provided for in this Section shall be deemed to

be, and hereby is, a grant by RFC to the Company of a security  interest in all of RFC’s right,  title and

interest,  whether now owned or hereafter  acquired,  in and to any and all general  intangibles,  payment

intangibles,  accounts, chattel paper, instruments,  documents,  money, deposit accounts,  certificates of

deposit,  goods, letters of credit,  advices of credit and investment property consisting of, arising from

or  relating  to any of the  following:  (A) the  Mortgage  Loans,  including  (i) with  respect  to  each

Cooperative  Loan,  the related  Mortgage  Note,  Security  Agreement,  Assignment of  Proprietary  Lease,

Cooperative Stock  Certificate,  Cooperative  Lease, any insurance policies and all other documents in the

related  Mortgage File,  (ii) with  respect to each Sharia Mortgage Loan, the related Sharia Mortgage Loan

Security  Instrument,  Sharia  Mortgage  Loan  Co-Ownership  Agreement,   Obligation  to  Pay,  Assignment

Agreement and Amendment of Security  Instrument,  any  insurance  policies and all other  documents in the

related  Mortgage File and (iii) with respect to each  Mortgage  Loan other than a  Cooperative  Loan or a

Sharia  Mortgage Loan,  the related  Mortgage  Note,  the Mortgage,  any insurance  policies and all other

documents  in the related  Mortgage  File,  (B) all  monies due or to become due  pursuant to the Mortgage

Loans in  accordance  with the  terms  thereof  and  (C) all  proceeds  of the  conversion,  voluntary  or

involuntary,  of the foregoing into cash,  instruments,  securities or other property,  including  without

limitation  all amounts  from time to time held or invested in the  Certificate  Account or the  Custodial

Account,  whether in the form of cash,  instruments,  securities or other property;  (c) the possession by

the  Trustee,  the  Custodian  or any other agent of the Trustee of Mortgage  Notes or such other items of

property as constitute  instruments,  money, payment  intangibles,  negotiable  documents,  goods, deposit

accounts,  letters of credit,  advices of credit,  investment property or chattel paper shall be deemed to

be  “possession  by the secured  party,” or  possession  by a  purchaser  or a person  designated  by such

secured  party,  for  purposes of  perfecting  the security  interest  pursuant to the  Minnesota  Uniform

Commercial Code and the Uniform Commercial Code of any other applicable jurisdiction  (including,  without

limitation,  Sections  8-106,  9-313 and 9-106  thereof);  and  (d) notifications  to persons holding such

property,  and  acknowledgments,  receipts or confirmations  from persons holding such property,  shall be

deemed notifications to, or acknowledgments,  receipts or confirmations from,  securities  intermediaries,

bailees or agents of, or persons  holding for, (as  applicable)  the Trustee for the purpose of perfecting

such security  interest under  applicable  law. RFC shall,  to the extent  consistent with this Agreement,

take such  reasonable  actions as may be necessary to ensure that, if this  Agreement  were  determined to

create a security  interest in the Mortgage Loans and the other property  described  above,  such security

interest would be determined to be a perfected  security  interest of first priority under  applicable law

and will be maintained as such  throughout  the term of this  Agreement.  Without  limiting the generality

of the  foregoing,  RFC shall prepare and deliver to the Company not less than 15 days prior to any filing

date,  and the  Company  shall  file,  or shall  cause to be filed,  at the  expense of RFC,  all  filings

necessary to maintain the  effectiveness  of any original filings  necessary under the Uniform  Commercial

Code as in effect in any  jurisdiction  to  perfect  the  Company’s  security  interest  in or lien on the

Mortgage Loans, including without limitation  (x) continuation  statements,  and (y) such other statements

as may be occasioned by (1) any  change of name of RFC or the Company,  (2) any  change of location of the

state of formation,  place of business or the chief  executive  office of RFC, or (3) any  transfer of any

interest of RFC in any Mortgage Loan.

                  Notwithstanding  the  foregoing,  (i) the Master  Servicer  shall  retain all  servicing

rights  (including,  without  limitation,  primary servicing and master servicing)  relating to or arising

out of the Mortgage Loans, and all rights to receive  servicing fees,  servicing income and other payments

made as compensation for such servicing granted to it under the Pooling and Servicing  Agreement  pursuant

to the  terms and  conditions  set forth  therein  (collectively,  the  “Servicing  Rights”)  and (ii) the

Servicing  Rights are not included in the collateral in which RFC grants a security  interest  pursuant to

the immediately preceding paragraph.

                  3.  Concurrently  with the execution and delivery hereof,  the Company hereby assigns to

RFC without  recourse  all of its right,  title and interest in and to the Class I-A-P  Certificates,  the

Class I-A-V  Certificates,  the Class  II-A-P  Certificates  and the Class  II-A-V  Certificates  and a de

minimis  portion  of each  of the  Class  R-I  Certificates,  Class  R-II  Certificates  and  Class  R-III

Certificates as part of the consideration payable to RFC by the Company pursuant to this Agreement.

                  4. RFC  represents  and  warrants to the Company  that on the date of  execution  hereof

(or, if otherwise specified below, as of the date so specified):

                  (a)      The information set forth in Exhibit One to the Series  Supplement with respect

to each  Mortgage  Loan or the  Mortgage  Loans,  as the case may be, is true and correct in all  material

respects, at the date or dates respecting which such information is furnished;

                  (b)      Each  Mortgage  Loan is required to be covered by a standard  hazard  insurance

policy.  Each Group I Loan with a  Loan-to-Value  Ratio at origination in excess of 80% will be insured by

a Primary  Insurance  Policy  covering  at least 35% of the  principal  balance  of the  Mortgage  Loan at

origination  if the  Loan-to-Value  Ratio is between  100.00%  and 95.01%,  at least 30% of the  principal

balance of the Mortgage Loan at origination if the  Loan-to-Value  Ratio is between 95.00% and 90.01%,  at

least 25% of the balance if the  Loan-to-Value  Ratio is between 90.00% and 85.01% and at least 12% of the

balance  if  the  Loan-to-Value   Ratio  is  between  85.00%  and  80.01%.  Each  Group  II  Loan  with  a

Loan-to-Value  Ratio at  origination  in  excess of 80% will be  insured  by a  Primary  Insurance  Policy

covering at least 30% of the principal  balance of the Mortgage Loan at origination  if the  Loan-to-Value

Ratio is between  100.00%  and  95.01%,  at least 25% of the  principal  balance of the  Mortgage  Loan at

origination if the  Loan-to-Value  Ratio is between 95.00% and 90.01%,  at least 12% of the balance if the

Loan-to-Value  Ratio is between  90.00% and  85.01%  and at least 6% of the  balance if the  Loan-to-Value

Ratio is between 85.00% and 80.01%.  To the best of the Company’s  knowledge,  each such Primary Insurance

Policy is in full force and effect and the Trustee is entitled to the benefits thereunder;

                  (c)      Each Primary  Insurance Policy insures the named insured and its successors and

assigns,  and the issuer of the Primary  Insurance  Policy is an  insurance  company  whose  claims-paying

ability is currently acceptable to the Rating Agencies;

                  (d)      Immediately  prior to the assignment of the Mortgage Loans to the Company,  RFC

had good title to, and was the sole  owner of,  each  Mortgage  Loan free and clear of any  pledge,  lien,

encumbrance  or security  interest  (other than rights to servicing  and related  compensation  and,  with

respect to certain  Mortgage  Loans,  the monthly  payment due on the first Due Date following the Cut-off

Date),  and no action has been taken or failed to be taken by RFC that would  materially  adversely affect

the enforceability of any Mortgage Loan or the interests therein of any holder of the Certificates;

                  (e)      No Mortgage  Loan was 30 or more days  delinquent  in payment of principal  and

interest  as of the  Cut-off  Date and no  Mortgage  Loan has been so  delinquent  more  than  once in the

12-month period prior to the Cut-off Date;

                  (f)      Subject to clause (e) above as  respects  delinquencies,  there is no  default,

breach,  violation or event of  acceleration  existing  under any  Mortgage  Note or Mortgage and no event

which,  with notice and  expiration  of any grace or cure  period,  would  constitute  a default,  breach,

violation or event of acceleration,  and no such default,  breach,  violation or event of acceleration has

been waived by the Seller or by any other entity involved in originating or servicing a Mortgage Loan;

                  (g)      There is no delinquent tax or assessment lien against any Mortgaged Property;

                  (h)      No  Mortgagor  has any  right of  offset,  defense  or  counterclaim  as to the

related  Mortgage Note or Mortgage  except as may be provided under the  Servicemembers  Civil Relief Act,

formerly  known as the  Soldiers’  and  Sailors’  Civil  Relief Act of 1940,  as amended,  and except with

respect to any buydown agreement for a Buydown Mortgage Loan;

                  (i)      There are no mechanics’ liens or claims for work,  labor or material  affecting

any  Mortgaged  Property  which  are or may be a lien  prior to, or equal  with,  the lien of the  related

Mortgage,  except  such  liens  that are  insured  or  indemnified  against  by a title  insurance  policy

described under clause (aa) below;

                  (j)      Each