TERMS SHEET This terms sheet contains selected information for quick reference only. You should read this Supplement, particularly "Risk Factors," and each of the other documents listed under "Available Information." Sponsor:    J.P. Morgan Securities Inc. Trustee:    U.S. Bank National Association Tax Administrator:    The Trustee Closing Date:    June 30, 2005 Distribution Date:    The 20th day of each month or, if the 20th day is not a Business Day, the first Business Day thereafter, commencing in July 2005. Trust Assets: Trust Asset Group Trust Asset Type Certificate Rate Original Term To Maturity (in years) 1 Underlying SMBS Securities (1) (1) 2 Ginnie Mae II 5.5% 30 3 Ginnie Mae II 6.5% 30 4 Ginnie Mae II 5.5% 30 (1)Certain information regarding the Underlying SMBS Securities is set forth in Exhibits A and B to this Supplement. Security  Groups:  This  series  of  Securities  consists  of  multiple  Security  Groups  (each,  a "Group"), as shown on the inside front cover of this Supplement and on Schedule I to this Supplement. Payments on each Group will be based solely on payments on the Trust Asset Group with the same numerical designation. Assumed Characteristics of the Mortgage Loans Underlying the Group 2, 3 and 4 Trust Assets1: Principal Balance2 Weighted Average Remaining Term to Maturity (in months) Weighted Average Loan Age (in months) Weighted Average Mortgage Rate3 Group 2 Trust Assets $200,000,000 355 3 5.95% Group 3 Trust Assets $  50,000,000 345 12 6.87% Group 4 Trust Assets $100,704,000 355 3 6.06% 1As of June 1, 2005. 2Does not include the Group 2 Trust Assets that will be added to pay the Trustee Fee. 3The Mortgage Loans underlying the Group 2, 3 and 4 Trust Assets may bear interest at rates ranging from 0.25% to 1.50% per annum above the related Certificate Rate. The actual remaining terms to maturity, loan ages and Mortgage Rates of many of the Mortgage Loans underlying the Group 2, 3 and 4 Trust Assets will differ from the weighted averages shown   above,   perhaps   significantly.   See   "The   Trust   Assets – The   Mortgage   Loans"   in S-4