Progress in Parkinson's Disease

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Abstract
Over the past few years important advances have taken place in the study of Parkinson's disease. Etiologic factors have been identified, new concepts and techniques have been applied to pharmacology, and innovative approaches have been adopted to elucidate problems in management.The search for the cause of parkinsonism has been initiated from several directions. The very low concordance rate of Parkinson's disease in twins has directed attention to environmental risk factors during adult life.1 Langston et al.2 demonstrated that a potent toxic agent, which can induce severe and prolonged parkinsonism, may gain access to the brain by accidental exposure, without . . .