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Morphological observation and identification of HUMSCs and HUMSC-sEVs. (a) Flow cytometry analysis of surface markers in HUMSCs. (b) Light morphology image of HUMSCs. (c) Morphology of HUMSC-sEVs under TEM. Scale bar, 100 nm. (d) Peak size of HUMSC-sEVs was around 80 nm as showed by NTA. (e) HUMSC-sEVs were positive for CD9, CD81, and CD63 as indicated by Western blot.
