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The most common mutation related to Parkinson’s disease (PD) is the p.G2019S mutation in the LRRK2 gene. Global population frequencies and crude estimates of haplotype conservation suggest most carriers are related. A total of 671 Norwegian PD patients and 215 of their family members were screened for the LRRK2 p.G2019S mutation. Twenty-one PD cases and 44 family members were positive for the mutation...