Common use of Authentication required Clause in Contracts

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27September 28, 2007 2006 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27December 21, 2007 2006 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 2726, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President Name: Title: This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27May 30, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President Name: Title: This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27May 29, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27November 29, 2007 2006 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇L▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Slough Senior Vice President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27August 28, 2007 2006 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27March 28, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ Slough Senior Vice President This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27May 30, 2007 2006 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President Name: Title: This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February July 27, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)

Authentication required. Unless this certificate has been executed by the Trustee or a duly authorized Authenticating Agent by manual signature, this certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose. IN WITNESS WHEREOF, Citicorp Mortgage Securities, Inc. has caused this certificate to be duly executed. CITICORP MORTGAGE SECURITIES, INC. By:_______________________________ D▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇ President Name: Title: This is one of the certificates referred to in the Pooling Agreement referred to above. U.S. BANK NATIONAL ASSOCIATION, as Trustee By:_______________________________ Authorized Signatory or CITIBANK, N.A., as Authenticating Agent for the Trustee, By:_______________________________ Authorized Signatory Date: February 27July 26, 2007 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common TEN ENT - as tenants by the entireties JT TEN - as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT - _______________ Custodian ____________________ (Cust) (Minor) Under Uniform Gifts to Minors Act ___________________________________ (State)