Five classes of mortgage pass-through certificates from J.P. Morgan Alternative Loan Trust series 2007-A1 have been downgraded by Fitch Ratings. The downgrades were as follows: class C-B-1, from AA to A-plus; class C-B-2, from A to BBB; class C-B-3, from BBB to B; class C-B-4, from BB to C/DR4; and class C-B-5, from B to C/DR5. Fitch also affirmed the rating on one class in the deal. The downgrades were attributed to deterioration in the relationship between credit enhancement and expected losses.
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