MSC-EV exerts their effects by transferring cargo components into target cells. Given that extracellular vesicles (EV) can deliver diverse cargo to recipient cells and elicit similar therapeutic effects, we investigate the cargo of both adipose-derived MSC-derived EV (AMSC-EV) and umbilical cord-derived MSC-derived EV (HUMSC-EV).As a crucial component of EV cargo, proteins are known to exert significant influence on EV functions. We performed a protein analysis of MSC-EV.