British and Swedish researchers using brain scans have discovered that the sudden movements, or dyskinesias, that are the usual adverse reactions from fetal-tissue transplant among Parkinson's disease patients are caused by an excess of serotonin cells in the transplanted tissues. This excess leads the brain to give out unregulated levels of the brain chemical dopamine that plays a role in movement. The discovery could allow for the modification of fetal cells, bioengineered cells or stem cells that will be used in future transplants among Parkinson's patients.

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