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Parkinson's Disease is a slowly progressive neurodegenerative illness characterized by: tremor, stiffness (rigidity), slowness of movement (bradykinesia) and difficulty with balance (postural instability). The symptoms appear when there is not enough dopamine in the brain. Dopamine is a naturally occurring chemical (neurotransmitter) that allows nerve cells to transmit messages between each other and then to muscles to allow normal movement to take place. In Parkinson's Disease, for reasons not yet understood, many of these cells have died. The remaining cells cannot produce enough dopamine. Most drug therapy replaces dopamine in the brain.


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