Figure 5: Protection of apoptosis by hUCB-MSCs as revealed by TUNEL assay in the injury site at 2 weeks after transplantation. (a)–(d) TUNEL staining (green) and staining with 4′,6-diamidino-2-phenylindole (blue) indicate undergoing apoptotic cell death. (e) Quantity of TUNEL positive cells. The number of TUNEL positive cells was significantly reduced in cell transplantation group than in control group. , scale bars denote: 10 μm.