In May 1995, neurologist Curt Freed began one of the most dramatic experiments in the history of medicine: the attempt to treat sufferers of Parkinson's disease by grafting human stem cells into their brains.Of the forty patients who volunteered for Freed's new treatment, half underwent authentic surgery. The other half, who had received placebo surgery, felt their last hope dissolve into bitter frustration. But the hardest road lay ahead for those...
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