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Genetic mutations affecting a single gene called LRRK2 play an outsized role in Parkinson's disease, but nobody's been able to say what the connection is between the genetic defect and the brain-cell die-off that characterizes the condition. Here's a clue.

Genetic mutations affecting a single gene called LRRK2 play an outsized role in Parkinson's disease, but nobody's been able to say what the connection is between the genetic defect and the brain-cell die-off that characterizes the condition. Here's a clue.

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Stanford researchers set out to test a seminal theory of Parkinson’s disease and several related conditions. What they found is more complex than anyone had imagined.

Stanford researchers set out to test a seminal theory of Parkinson’s disease and several related conditions. What they found is more complex than anyone had imagined.