Gastrointestinal melatonin: cellular identification and biological role. Kvetnoy I, Ingel I, Kvetnaia T, Malinovskaya N, Rapoport S, Raikhlin N, Trofimov A, Yuzhakov V. Journal Article 2002; 23(2): 121-132 PubMed PMID: 12011798 Keywords: Animals, Digestive System:cytology, Digestive System Physiological Phenomena, Enterochromaffin Cells:physiology, Humans, Melatonin:physiology,. Citation : Melatonin, a pineal hormone, because of its wide activity spectrum, is a subject of much current interest for biologists and physicians...... Read abstract Full text PDF