only in taxon only_in_taxon in taxon protein secretion peptide hormone secretion insulin secretion https://github.com/geneontology/go-ontology/issues/11255#issuecomment-426191045 GO:0030073 The regulated release of proinsulin from secretory granules accompanied by cleavage of proinsulin to form mature insulin. In vertebrates, insulin is secreted from B granules in the B cells of the vertebrate pancreas and from insulin-producing cells in insects. biological_process Eumetazoa