Exosomes are small membrane-bound vesicles that are secreted by a multitude of eukaryocytes as a consequence of fusion of multivesicular bodies with the plasma membrane.

• 摘要胞外体是源于多种真核细胞的多泡体，通过后者与质膜融合释放到细胞外的一种膜性小囊泡，在多种生理过程中发挥作用。