In this April, 2008 photo, Kyoto University Professor Shinya Yamanaka, left, and British researcher John Gurdon exchange words as they attend a symposium on induced pluripotent stem cell in Tokyo. Gurdon and Yamanaka of Japan won this year's Nobel Prize in physiology or medicine on Monday, Oct. 8, 2012 for discovering that mature, specialized cells of the body can be reprogrammed into stem cells - a discovery that scientists hope to turn into new treatments. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA

Associated Press
In this April, 2008 photo, Kyoto University Professor Shinya Yamanaka, left, and British researcher John Gurdon exchange words as they attend a symposium on induced pluripotent stem cell in Tokyo.  Gurdon and Yamanaka of Japan won this year's Nobel Prize in physiology or medicine on Monday, Oct. 8, 2012 for discovering that mature, specialized cells of the body can be reprogrammed into stem cells - a discovery that scientists hope to turn into new treatments. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA
In this April, 2008 photo, Kyoto University Professor Shinya Yamanaka, left, and British researcher John Gurdon exchange words as they attend a symposium on induced pluripotent stem cell in Tokyo. Gurdon and Yamanaka of Japan won this year's Nobel Prize in physiology or medicine on Monday, Oct. 8, 2012 for discovering that mature, specialized cells of the body can be reprogrammed into stem cells - a discovery that scientists hope to turn into new treatments. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA
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