The regulated release of serotonin by a cell. Serotonin (5-hydroxytryptamine, or 5-HT) is a monoamine synthesised in serotonergic neurons in the central nervous system, enterochromaffin cells in the gastrointestinal tract and some immune system cells. [GOC:ef, ISBN:0198506732, ISBN:0781735149]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process