Moody's Investors Service also issued a flood of negative rating actions Oct. 19, downgrading over 30 classes of mortgage-backed securities and placing over 50 MBS classes on review for possible downgrade.Among the securities affected by the downgrades were: 16 classes of Nomura Asset Acceptance Corp. Alternative Loan Trust certificates; 11 classes of Merrill Lynch Mortgage Investors Trust certificates; and six classes of Morgan Stanley Mortgage Loan Trust certificates. Among those placed under review were: 13 classes issued by Structured Asset Investment Loan Trust; and 11 classes issued by Credit Suisse. The rating actions were attributed to an analysis of the credit enhancement provided by subordination, overcollateralization, and excess spread relative to expected losses. Moody's can be found online at http://www.moodys.com.

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