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The symptoms of Parkinson's disease (PD) appear only after substantial degeneration of the dopaminergic neuron system (e.g. an 80% depletion of striatal dopamine) - that is, there is a substantive presymptomatic period of the disease. It is widely believed that dopamine-related compensatory mechanisms are responsible for delaying the appearance of symptoms. Recent advances in understanding the presymptomatic...
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