Figure 3: Schematic diagrams of maps ((a), (c), (e), (g)) and photomicrographs ((b), (d), (f), (h)) of TH+ amacrine cells in the retinae of Saline ((a), (b)), Saline-NIr ((c), (d)), MPTP ((e), (f)), and MPTP-NIr ((g), (h)) groups of the Ac-Sim case (this case shown because it had the most change after MPTP treatment). The photomicrographs are of a midregion of superior temporal retina in each case. In the saline control groups ((a)–(d)), TH+ cells were distributed relatively uniformly across the retina, but with a slight concentration in superior and temporal retina. In the MPTP and MPTP-NIr groups ((e)–(h)), there was no particular region of retina that was affected particularly after MPTP (or NIr) treatment. Scale bar = 100 μm.