Comerica Inc.'s redemption of $500 million in trust-preferred securities will save it more than $20 million a year and sets an example of Dodd-Frank Act adaptation for a handful of other regional banks.

But the financial reform law's restrictions on the hybrid securities affect a minority of the largest trups issuers, and not even all of these banking companies may want, or be in a position, to redeem the paper immediately.

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