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The microscopic picture of the MSCs in each induction group. a The control group. b The 5-aza + salB + CLM group. c Purified cardiomyocytes. The original MSCs are spindle-shaped and only have two cusps; the cardiomyocytes were more like rectangles and showed spontaneous contraction under microscope. The spindle-shaped MSCs gradually possessed three or four cusps during the differentiation process. Scale bar 50 µm
