Carcinoids of the gastrointestinal tract.
D002276:Carcinoid Tumor / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis*; D006801:Humans; D012701:Serotonin / Q000378:metabolism
D012701:Serotonin