IL4 and Parkinson disease: Though MHC I & II are closely related to inflammatory reaction in MPTP‐driven PD mice,26 neither the pro‐inflammatory molecules (including COX2, iNOS, C1q, IL1α, IL1β and IL6) nor the anti‐inflammatory molecules (IL4, CD206, YM1/2 and Arginase) showed expressing alternation in mice of both CD and repopulation groups after MPTP administration (Figure 7A).