Parkinson's disease develops due to a lack of ____ in the substantia nigra part of the brain, a key area for regulating motor movement.

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Parkinson's disease develops due to a lack of dopamine in the substantia nigra part of the brain. Dopamine is a neurotransmitter that plays a key role in regulating motor movement, and the loss of dopamine-producing neurons in the substantia nigra leads to the characteristic symptoms of Parkinson's disease, such as tremors, rigidity, and difficulty with movement and coordination.

Parkinson's Disease Develops Due to a Lack of ____ in the Substantia