Objective:To explore the method of using 5-bromo-2-deoxyuridine(Brd U)to label human umbilical cord mesenchymal stem cells(h UC-MSCs),and to explore its effect on cell proliferation and apoptosis. Methods:HUC-MSCs were isolated and cultured by direct adherent method,then the surface marker and potential ability of multi-direction differentiation were analyzed.The fifth passage of cells were labeled with Brd U at concentrations of 10,15,20,25 μmol/L,excluding Brd U as control group. Cells were cultivated res...