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Unformatted text preview: Nicotine Amphetamines The Reward Pathway: Addiction Tolerance Downregulation = Brain fights back Withdrawal Dopamine and Parkinsons Disease Every neurotransmitter = various sites in brain Dopamine = not just reward system Parkinsons Disease Symptoms Substantia nigra Decreased dopamine production L-Dopa What does it do? Why is not a long-term solution?...
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