NEW YORK — Greek debt has been tempest-tossed in recent weeks, but investors in U.S. regional bank stocks could be excused for reaching for Dramamine themselves.

A whole slew of American regional lenders, like Fifth Third Bancorp, Huntington Bancshares Inc. and Regions Financial Corp., have no clear interest in the sovereign debt of Greece. But that lack of connection hasn't stopped investors from buying and selling regional-bank stocks in tandem with recent broader market rallies and sell-offs, many tied to fears of Greece.

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