Class B-3 of Structured Asset Mortgage Investments Trust, series 2001-4, has been downgraded from Baa2 to Baa3 by Moody's Investors Service.The transactions are backed by first-lien fixed-rate mortgage loans. The downgrade was attributed to weak performance by the underlying loans, with historical and expected cumulative losses exceeding original expectations. Future losses could cause the writedown of the nonrated subordinate certificates in the deal, Moody's said.

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