What is an exosome?

Exosomes are small (~ 100 nm diameter) vesicles of endocytic origin that are naturally produced by many cell types and are released into several bodily fluids, including the bloodstream. Extracellular vesicles contain a variety of cargo including DNA, RNA, microRNA and protein. Due to the cell membrane and effective packaging, extracellular vesicles provide a stable environment for the cargo while circulating in the bloodstream.