Four classes of CS First Boston mortgage-backed securities, series 2001-2, have been downgraded by Fitch Ratings.The downgrades were as follows: classes B-3 and B-4, from BBB to BB; class B-5, from BB to B; and class B-6, from B to C. In addition, the ratings on three classes in the deal were affirmed. Fitch attributed the downgrades to realized and expected losses. The 0.15% original credit support provided by the unoffered class B-7 certificate has been depleted, the rating agency said.

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