Thirteen tranches from five deals issued by Residential Asset Securitization Trust in 2006 and late 2005 have been downgraded by Moody's Investors Service, and five tranches have been placed under review for possible downgrade.One downgraded tranche remains on review for possible downgrade. Moody's said the negative rating actions were based on higher-than-expected rates of delinquency, foreclosure, and real estate owned in the underlying collateral relative to credit enhancement levels. The collateral consists primarily of first-lien, fixed-rate, alternative-A mortgage loans.
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