Sixteen classes from eight mortgage-backed securities transactions issued in 2001 by Credit Suisse First Boston Mortgage Securities Corp. have been downgraded by Moody's Investors Service.In addition, Moody's upgraded one class from one of the CSFB deals and confirmed the rating on one other class. The downgrades were attributed to higher-than-expected losses, especially as a result of high loss severities. The securitizations are backed by pools of subprime first-lien adjustable- and fixed rate mortgages, Moody's said. The rating agency can be found on the Web at http://www.moodys.com.
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