Parkinson's disease linked to environmental causes

A US study has concluded that most Parkinson's disease cases are linked to environmental rather than genetic causes.1 The study of 500 pairs of twins of whom one or both suffered from the disease found that it was no more likely in identical twins than in non-identical twins - showing that genetics was not a significant factor. Only a rare form of the disease which generally develops before the age of 50 appears to be mostly genetic in origin.

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