On July 30, the FDIC closed a sale of RMBS backed by approximately $471.3 million of performing single-family mortgages from 16 failed banks.  The approximately $400 million senior certificates, representing 85% of the capital structure, are guaranteed by the FDIC.  The subordinated certificates, comprised of a mezzanine class and an over-collateralization class, represent 15% of the capital structure and will initially be retained by the failed bank receiverships. FDIC Release.