<prompt> Metabolites of tryptophan can give rise to:DiarrhoeaVasoconstrictionFlushingAll  <response>: Trytophan is an essential amino acid and is precursor of Serotonin, Melatonin Niacin.Clinical effects of Serotonin or 5Htase: Symptoms occur due to effect on smooth muscle. Cutaneous vasomotor episodes of flushing.- Potent vasoconstriction.- Chronic diarrhoeaRespiratory distress bronchospasm.Albinism accompanies defective melanine, product of tyrosine biosynthesis 