NMNAT3 and Parkinson disease: Correlation analysis of α-syn and NMNAT3 protein expressions using NDC subjects, either separately or pooled with the PD patient cases, revealed no correlation between α-syn and NMNAT3 protein levels (r = 0.44, P = 0.56, n = 6 for NDC subjects; r = −0.69, P = 0.84, n = 13 for whole cohort).