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One function of a stem cell is that it divides throughout the body replenishing any dying cells. Stem cells also regenerates any damaged tissues.

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Neurotransmitters, also known as chemical messengers allows neurons to communicate.

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Parkinson's disease affects the substania nigra. This is located deep into the brain, which plays a huge part with movement. Since this is so deep into the brain, doctors are unable to get actual parkinson's disease cells.

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- Loss of smell
- Could have anxiety
- Leaking of urine
- Jaw could become stiff
- Poor balance, fatigue
- Nightmares, as well as daytime sleepiness
- Tremors, which can occur of rest