GFAP and Parkinson disease: At this differentiation time point, only a small fraction of cells expressed βΙΙΙ-tubulin+ (TUJ1+: CTR 8.6 ± 2.48% and PD 10.12 ± 1.89%) and MAP2+ (>4% in both CTR and PD cultures), while GFAP+ cells (glial fibrillary acidic protein; astrocytic marker) were not detected.