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Associated Press
In this photo provided by Cedars-Sinai, Clive Svendsen, PhD, left, director of the Cedars-Sinai Regenerative Medicine Institute, leads Stephen Hawking, third from left, on a tour of the Regenerative Medicine Institute at Cedars-Sinai Medical Center in Los Angeles on Tuesday, April 9, 2013. Others are unidentified. (AP Photo/Cedars-Sinai, Eric Reed)

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