GFAP and Parkinson disease: Moreover, the immunohistochemical staining showed that MHC-II co-localized with the astrocytic markers GLAST (Fig. 1f) and GFAP (Fig. 1g), as well as with the microglial marker Iba1 (Fig. 1h) in both PD and control brain sections, demonstrating that both microglia and astrocytes express MHC-II.