PDGFRB and Parkinson disease: Although MPTP + PD FMT mice did not exhibit significant alterations in pericyte markers in either the striatum (Fig. 7B) or SNc (Fig. 7D, F) relative to MPTP-treated mice, MPTP + HC FMT mice showed significantly more CD13+ and PDGFRβ+ cells in the SNc (the MPTP + HC FMT group vs. the MPTP group, P < 0.01, Fig. 7F).