On the same day that Wells Fargo & Co. made its hostile takeover bid for First Interstate Bancorp last week, One Valley Bancshares in Charleston, W.Va., adopted a shareholder protection rights plan, or "poison pill."

The timing was merely coincidental - One Valley's plan had been under consideration for six months - but last week's drama in California likely will induce other banks to implement similar poison pills for fear of falling victim to a hostile takeover, analysts said.

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