|Parkinson's disease (PD) is a type of movement disorder. It happens when nerve cells in the brain don't produce enough of a brain chemical called dopamine. It begins usually in the sixth decade and is characterized by rigidity, tremor at rest, slowness of voluntary movement, an expressionless (mask-like) face, stooped posture, and a shuffling, small-step gait. Parkinson's disease pathology is a science that investigates the causes, processes, and effects of Parkinson's disease.
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