on your security may occur much earlier than the final distribution date. Support securities will be more sensitive to rates  of  principal  payments  than  other securities. If principal prepayments result in principal  distributions  on  any  distribution date equal to or less than the amount needed to produce scheduled payments on the PAC class, the support class will not receive any principal distribution on that date. If prepay- ments result in principal distributions on any distribution  date  greater  than  the  amount needed to produce scheduled payments on the PAC class for that distribution date, this excess  will  be  distributed  to  the  support class. The rate of principal payments on the un- derlying certificates will directly affect the rate of principal payments on the group 2 securities.  The  underlying  certificates  will be sensitive in varying degrees to •  the rate of payments of principal (includ- ing prepayments) of the related mortgage loans, and •  the priorities for the distribution of princi- pal among the classes of the related under- lying series. As described in the related underlying certifi- cate  disclosure  documents,  the  underlying certificates included in trust asset group 2 are not entitled to distributions of principal until certain classes of the related underlying se- ries have been retired and, accordingly, dis- tributions    of    principal    of    the    related mortgage loans for extended periods may be applied  to  the  distribution  of  principal  of those  classes  of  certificates  having  priority over the underlying certificates. In addition, the principal entitlement of the underlying certificates included in trust asset group 2 on any payment date is calculated on the basis of schedules; no assurance can be given that the underlying certificates will ad- here to their schedules. Further, with respect to  trust  asset  group  2,  prepayments  on  the related mortgage loans may have occurred at rates  faster  or  slower  than  those  initially assumed. This supplement contains no information as to  whether  the  underlying  certificates  have adhered to the applicable principal balance schedules,  whether  any  related  supporting classes  remain  outstanding  or  whether  the underlying  certificates  otherwise  have  per- formed as originally anticipated. Additional information as to the underlying certificates may be obtained by performing an analysis of current  principal  factors  of  the  underlying certificates in light of applicable information contained  in  the  related  underlying  certifi- cate disclosure documents. The securities may not be a suitable invest- ment for you. The securities, especially the group 2 securities and, in particular, the sup- port,   interest  only,   principal  only,   inverse floating  rate   and  residual  classes,  are  not suitable investments for all investors. In addition, although the sponsor intends to make a market for the purchase and sale of the  securities  after  their  initial  issuance,  it has no obligation to do so. There is no assur- ance that a secondary market will develop, that any secondary market will continue, or that the price at which you can sell an invest- ment in any class will enable you to realize a desired yield on that investment. You will bear the market risks of your invest- ment. The market values of the classes are likely to fluctuate. These fluctuations may be significant  and  could  result  in  significant losses to you. The secondary markets for mortgage-related securities  have  experienced  periods  of  illi- quidity and can be expected to do so in the future. Illiquidity can have a severely adverse effect on the prices of classes that are espe- cially sensitive to prepayment or interest rate risk or that have been structured to meet the investment  requirements  of  limited  catego- ries of investors. The residual securities may experience sig- nificant adverse tax timing consequences. Ac- cordingly,   you   are   urged   to   consult   tax S-12