2008-08-21 23:20:05 -

- J.P. Morgan Alternative Loan Trust, series 2008-R4, is rated by Fitch as follows:

--$426,327,000 class 2-A-1 'AAA'.

This transaction, consisting of two non-crossed groups, each group with two certificates, is a resecuritization of a senior residential mortgage pass-through certificate. The underlying certificates for Group 2 are Countrywide Alternative Loan Trust 2006-35CB class A1, and Countrywide Alternative Loan Trust 2007-10CB class A17, class A18 and class A19, which are backed by a pool of primarily one- to four-family, first lien, fixed-rate residential mortgage loans. As a resecuritization, the certificates will receive their cash flow from the underlying classes of certificates.

Fitch's rating definitions and the terms of use of such ratings are available on the agency's public

site, www.fitchratings.com. Published ratings, criteria and methodologies are available from this site, at all times. Fitch's code of conduct, confidentiality, conflicts of interest, affiliate firewall, compliance and other relevant policies and procedures are also available from the 'Code of Conduct' section of this site.

Fitch Ratings, New York
Wen Hsu, 212-908-0633
Sandro Scenga, 212-908-0278 (Media Relations)