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What is Parkinson's Disease?

From , former About.com Guide

Updated March 04, 2006

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Question: What is Parkinson's Disease?
Answer: Parkinson's disease is a chronic progressive disease that occurs when a group of cells in the substantia nigra of the brain malfunction and die. This results in a substantial loss of a neurotransmitter (chemical messenger) called Dopamine. Dopopamine transports the signals to the part of the brain that controls movement, coordination and initiation.

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