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Substances that block me can paralyze you because I am the link between the brain and muscles. When there's not enough of me, I can be involved in Alzheimer's and Parkinson's disease. Increase me, and I can help with symptoms, but be cautious, because I also have a role in addiction. Dr. Stahl refers to me as "the brain's own nicotine" when he talks about my role in addiction.

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