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The effect of melatonin, its precursor l-tryptophan, and melatonin metabolite AFMK on pancreatic enzyme secretion. AFMK: N1-acetyl-N1-formyl-5-metoxykynuramine, CCK: cholecystokinin, dotted line arrow: nervous signal transmission via vago-vagal, entero-pancreatic reflex, up arrow: nervous signal delivery, bold arrow: CCK release stimulated by L-tryptophan, melatonin, and probably (?) by AFMK.
