Class B-4 of Bear Stearns Mortgage Securities Inc. mortgage pass-through certificates, series 2001-4, has been downgraded from CCC to CC by Fitch Ratings.The rating agency also upgraded eight classes and affirmed the ratings on 23 other classes in five Bear Stearns deals. The downgrade was attributed to credit enhancement levels relative to loss expectations. The underlying collateral consists of 15- to 30-year adjustable-rate and fixed-rate mortgages extended to prime borrowers, Fitch said.

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