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New study finds genetic factor fends off Alzheimer’s and Parkinson’s

About one in every five people carries a version of a gene that—although largely unsung—appears to confer protection against both Alzheimer’s disease and Parkinson’s disease, Stanford Medicine investigators and their colleagues have learned. These lucky people may someday benefit all the more from a vaccine that could slow or stall the progression of these two most common neurodegenerative conditions.