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Exosomes are nano-sized extracellular vesicles (about 30-200 nm) that bud from endosomal membranes and are released by almost every cell type. 6 Because they are enclosed by a lipid bilayer and carry proteins, lipids and various RNAs, exosomes act as messengers between cells and can be harvested from blood, urine, milk or cultured cells. In regenerative medicine, purified exosomes have emerged as…