The protein expression level of NMNAT3 (Fig. 1B) was significantly decreased in the caudate nucleus of PD compared to NDC subjects (1.03 ± 0.23 versus 0.4 ± 0.08, P = 0.02) but was not significantly different in the cerebella of NDC compared to PD subjects (0.58 ± 0.15 versus 0.68 ± 0.11, P = 0.57). The gene discussed is NMNAT3; the disease is Parkinson disease.