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Identification of the human umbilical cord mesenchymal stem cells (hUCMSC) and hUCMSC-derived exosomes. (a) Mesenchymal stem cell morphology of the first- and second-generation umbilical cord mesenchymal stem cells (scale bar 50 μm). (b) Flow cytometric analysis of the expression of cell surface markers related to mesenchymal stem cells.
