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Nitric oxide synthase (NOS) genes (NOS1, NOS2A, and NOS3) may create excess nitric oxide that contributes to neurodegeneration in Parkinson’s disease (PD). NOS genes might also interact with one another or with environmental factors in PD. Coding and tagging single nucleotide polymorphisms (SNPs) (27 NOS1, 18 NOS2A, and five NOS3 SNPs) were genotyped in families with PD (1,065 cases and 1,180 relative...
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