Dopamine nerve terminals are protected in FcγR−/− mice treated with chronic MPTP. A, representative photomicrographs showing TH+ fiber density from the striatum of indicated littermate treatment groups. Sal, saline. B, optical density quantification of striatal TH+ fiber density. C, representative photomicrographs of striatal sections stained for DATs from indicated littermate groups. D, optical density quantification of striatal DATs. Scale bars = 50 μm in (A) and 200 μm (C). Error bars represent mean ± S.E. ANOVA, *, p < 0.05; **, p < 0.01; ***, p < 0.001; n = six to eight animals per group.