Cell Component
extracellular exosome
Subclass of:
Extracellular Vesicles; Transport Vesicles
Definitions related to exosomes:
  • A secretory vesicle between 30 and 90 nm in diameter that can play a role in receptor recycling, plasma membrane protein shedding, and the secretion of proteins and RNA.
    NCI
    U.S. National Cancer Institute, 2021
  • A type of extracellular vesicle, containing RNA and proteins, that is secreted into the extracellular space by EXOCYTOSIS when MULTIVESICULAR BODIES fuse with the PLASMA MEMBRANE.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (extracellular exosome) A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
    Gene Ontology Dictionary
    Gene Ontology Consortium, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.