Mycogen Corp. on Monday said its board has adopted astockholder rights plan designed to prevent a hostile takeover.The plan, which Mycogen said was not in response to anyoverture, would be triggered by an investor acquiring 15percent of the San Diego company's outstanding stock(NASDAQ:MYCO). Stockholders would receive rights to purchaseshares of a new class of preferred stock at a substantialdiscount. Mycogen shares closed unchanged Monday at $14.

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