Did Stem Cells Play a Role in Pitcher's Comeback?

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Bartolo Colon goes for his third victory of the season tonight as the New York Yankees host archrival Boston. That would be three wins more than he notched all of last season. In fact, Colon didn't even pitch last season.

The right-hander's remarkable comeback from elbow and shoulder injuries that have plagued him since 2005 has been attributed, at least in part, to stem cell injections administered during a 45-minute procedure in April 2010. The New York Times reported this week that Colon's agent had informed the Yankees of the procedure, and that the Yankees in turn informed Major League Baseball. An MLB spokesperson told the Times that the league is "looking into it."

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