Gastric ECL, APUD, and enterochromaffin-like cells.
D006916:5-Hydroxytryptophan / Q000378:metabolism; D001078:APUD Cells / Q000378:metabolism*; D000818:Animals; D002838:Chromaffin System / Q000378:metabolism*; D004759:Enterochromaffin Cells / Q000378:metabolism*; D008297:Male; D051381:Rats; D012701:Serotonin / Q000096:biosynthesis
D012701:Serotonin; D006916:5-Hydroxytryptophan