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Dr. George Daley (left) and Dr. Leonard Zon, both stem cell researchers at Children's Hospital, responded to media questions during a press conference at yesterday at the State House. ( Globe Staff Photo / Lane Turner)
Dr. George Daley (left) and Dr. Leonard Zon, both stem cell researchers at Children's Hospital, responded to media questions during a press conference at yesterday at the State House. ( Globe Staff Photo / Lane Turner)

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