Meanwhile, three other classes of GS Mortgage Securities Corp. mortgage pass-through certificates have been downgraded by Fitch Ratings.The downgrades in series 2005-SEA1 were as follows: class B-1, from BBB-plus to BB; class B-2, from BBB to B; and class B-3, from BBB-minus to CC/DR3. Fitch also placed class M-2 on Rating Watch Negative and affirmed the ratings on several other classes. Fitch said the downgrades were based on a deterioration in the relationship between credit enhancement and loss expectations. The collateral for the deal consists primarily of first- and second-lien residential mortgage loans.

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