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Parkinson's is a result of the loss of cells in various parts of the brain, including one portion that produces the neurotransmitter dopamine. Dopamine is essential for being able to move in a coordinated way, so the loss of dopamine causes the tremors often associated with the condition. While the exact cause of Parkinson's is unknown, genetics and environment are contributing factors. Most cases occur in patients with no family history of Parkinson's disease, but there are 13 gene mutations that have been linked to either causing the disease or increasing one's risk of developing it. Certainly not everyone who carries these gene mutations develops Parkinson's, but identifying these genetic indicators is the beginning of developing more precise treatments.