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Kior Falls After Biofuel Maker Warns of Possible Default

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Kior Inc., the Vinod Khosla-backed operator of the first U.S. commercial-scale cellulosic biofuel plant, fell the most on record after management told regulators they have serious doubts about staying in business.

Kior declined 39 percent to 65 cents at the close in New York, the most since its June 2011 initial public offering at $15.