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Characterization of MSC-Exo. a Transmission electron microscopy image of exosomes. The black arrows indicate exosomes. b Nanoparticle tracking analysis of the size of MSC-Exo. c Western blot analysis of the expression of characteristic exosomal proteins (CD63, TSG101, HSP70, CD81). d The internalization of PKH67-labelled MSC-Exo (green) by EC after 6 h of incubation (magnifications, × 1000). All figures represent the average of three sets of independent experiments
