San Diego—After two airplanes sliced into New York City's World Trade Center towers on the morning of September 11, thousands of people navigated through smoke, fear, and confusion to emerge from the stricken buildings. Among the survivors was a man with Parkinson disease (PD), an electrician working on the 34th floor of one of the towers, who several years earlier had participated in a study in which fetal dopamine neurons were implanted in his brain.
Unimpeded by the slowed movements and shuffling steps that progressively immobilize people with PD, he descended 33 flights of stairs, ran five blocks when the buildings collapsed, and walked three miles to Penn Station to wait for a train to take him home.
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