SLC6A3 and Parkinson disease: In this separate cohort, we found that PD patients (N = 8) exhibited significant increases in DAT+ and TH+ PBMCs relative to healthy control subjects (N = 4) (t-test with Holm-Sidak correction, P < 0.05, N = 4–8 independent biological replicates per group), but NET+ PBMCs are not significantly different between groups (two-tailed t-test with Holm-Sidak correction, p = 0.802).