NOS2 and Parkinson disease: The upregulation of inflammatory molecules, such as the inducible nitric oxide synthase (iNOS) (Hunot et al. 1996); the increase of the lysosome‐associated protein CD68, a phagocytosis‐associated marker (Doorn et al. 2014); and elevated levels of pro‐inflammatory cytokines (Nagatsu et al. 2000) were all observed in postmortem brains of PD patients.