In the vast majority of cases of Parkinson's disease, or "shaking palsy," physicians cannot be sure what originally caused the nerve damage that results in the patient's tremor, muscle rigidity, forward-falling posture, hasty gait and "pill-rolling" movements of the fingers. As with most diseases of which the basic causes are unknown, there is a yard-long list of drugs that have been tried; some give modest relief, but all fall far short of cure. Even radical brain surgery usually relieves only some of the symptoms. Now a new drug has been found that...
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