Co-localization of BrdU-positive cells with different cell markers. A: Relative numbers of co-localization of NG2-positive cells with BrdU+ cells (NG2+), CNPase- positive cells with BrdU+ cells (CNPase+) and unidentified BrdU+ cells (BrdU+) in saline treated, healthy controls (left panel) and MPTP treated animals (right panel) at different time points. B-D: Overview of exemplary BrdU+ cells expressing characteristic cell markers in the substantia nigra after 10 days. Left panel shows BrdU (red), central panel shows markers NG2 (blue), CNPase (blue), NesGFP (green), right panel shows overlay. Scale bar 10μm.