The aggregation, arrangement and bonding together of a set of components to form an extracellular vesicular exosome, a membrane-bounded vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Exosomes are defined by their size, which generally ranges from 30 nm to 100 nm. [GOC:mah, GOC:tfm, PMID:19442504, PMID:27462458]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process