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Serotonin solves decades-old mystery in Parkinson's disease Sudden, uncontrolled movements called dyskinesias -a common side effect of treatment for Parkinson`s disease - are a result of excess serotonin cells in transplanted tissue that trick the brain into releasing dopamine, suggests a new study of two Parkinson's disease patients that received fetal tissue transplants over a decade ago, researchers report in the June 30 issue of Science Translational Medicine.
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