Figure 1.

Characterization of exosomes derived from human umbilical cord‐derived mesenchymal stem cells (uMSCs) and HEK293 cells. A, Representative image of purified exosome particles (left panel) and the particle size distribution in purified uMSC‐Exo (right panel) as determined by NanoSight. The red arrow indicates exosomes. B, Precise particle size distribution of purified uMSC‐Exo and HEK293‐Exo measured by laser light scattering spectrometer. The dashed dot line indicates the peak particle size of purified exosomes. C, Western blot analysis of the exosomes surface markers. D, Morphology of the exosomes observed by TEM