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Urothelial differentiation of human BMSCs on day 7 after induction. (a) Human bladder urothelial cell (p4) control, (b) noninduced human BMSC (p4) control, (c) human BMSCs induced (arrows) by coculture with urothelium, and (d) human BMSCs induced (arrows) by CM from urothelium. Original magnification, × 100. BMSC, bone marrow mesenchymal stem cell; CM, conditioned medium.
