An MMDA is a deposit account, insured by the FDIC if it's in an insured institution. You can't have an uninsured deposit account in an FDIC-member bank.
If what you're describing is a non-deposit investment vehicle, such as a repurchase agreement ("repo") or some other form of investment, that's a different matter.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8