Whether the injected stem cells rejuvenated his arm is an open question. The fda and the International Society for Stem Cell Research warn that no rigorous studies have demonstrated that such treatments safely and effectively repair damaged connective tissue in people.
http://www.scientificamerican.com/article.cfm?id=a-dangerous-game-athletes-risk-untested-stem-cell-treatments
http://www.scientificamerican.com/article.cfm?id=a-dangerous-game-athletes-risk-untested-stem-cell-treatments
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