Fig. 1From: Exosomes from human umbilical cord mesenchymal stem cells attenuate the inflammation of severe steroid-resistant asthma by reshaping macrophage polarizationhUCMSC-Exo characterization. a Transmission electron microscopy analysis of vesicles derived from hUCMSCs (scale bar = 100 nm). b Nanoparticle tracking analysis of vesicles derived from hUCMSCs. c Exosome representative markers CD63 and CD81 were detected by flow cytometry analysisBack to article page