LIBOR decreases below that level, the Effective Rate for Class FC may change or cease to exist and its Weighted Average Life may be extended, perhaps significantly. Moreover, the Mortgage Loans will not prepay at any constant rate. Non-constant prepayment rates can cause any PAC or TAC Class not to receive Scheduled Payments, even if prepayment rates remain within the initial Effective Range (or if prepayment rates average the Effective Rate), if any, for that Class. Further, the Effective Range for any PAC Class can narrow, shift over time or cease to exist and the Effective Rate for the TAC Class can change or cease to exist depending on the actual characteristics of the Mortgage Loans. If the related Mortgage Loans prepay at rates that are generally below the Effective Range or Rate for any PAC or TAC Class, the amount available to pay principal on the Securities may be insufficient to produce Scheduled Payments on such related PAC or TAC Class, if any, and its Weighted Average Life may be extended, perhaps significantly. If the related Mortgage Loans prepay at rates that are generally above the Effective Range or Rate for any PAC or TAC Class, its supporting Classes may be retired earlier than that PAC or TAC Class, and its Weighted Average Life may be shortened, perhaps significantly. Assumability Each Mortgage Loan may be assumed, subject to HUD review and approval, upon the sale of the related Mortgaged Property. See "Yield, Maturity and Prepayment Considerations – Assumability of Government Loans" in the Base Offering Circular. Final Distribution Date The Final Distribution Date for each Class, which is set forth on the front cover of this Supplement  or  on  Schedule  I  to  this  Supplement,  is  the  latest  date  on  which  the  related Class Principal Balance or Class Notional Balance will be reduced to zero. •   The actual retirement of any Class may occur earlier than its Final Distribution Date. •   According to the terms of the Ginnie Mae Guaranty, Ginnie Mae will guarantee payment in full of the Class Principal Balance of each Class of Securities no later than its Final Distribution Date. Modeling Assumptions Unless otherwise indicated, the tables that follow have been prepared on the basis of the following assumptions (the "Modeling Assumptions"), among others: 1.  The Mortgage Loans underlying the Trust Assets have the assumed characteristics shown under "Assumed Characteristics of the Mortgage Loans Underlying the Trust Assets" in the Terms  Sheet,  except  in  the  case  of  information  set  forth  under  the  0%  PSA  Prepayment Assumption Rate, for which each Mortgage Loan underlying a Trust Asset is assumed to have an original and a remaining term to maturity of 360 months and a Mortgage Rate of 1.50% per annum higher than the related Certificate Rate. 2.  The  Mortgage  Loans  prepay  at  the  constant  percentages  of  PSA  (described  below) shown in the related table. 3.  Distributions  on  the  Securities  are  always  received  on  the  20th  day  of  the  month, whether or not a Business Day, commencing in November 2007. 4.  A termination of the Trust does not occur. 5.  The Closing Date for the Securities is October 30, 2007. S-16