Metabolites of tryptophan can give rise to
Diarrhoea
Vasoconstriction
Flushing
All of these
Serotonin (a metabolite of tryptophan) causes vasoconstriction, flushing, chronic diarrhea and respiratory distress due to bronchospasm.
Albinism is a defect in the metabolism of tyrosine due to deficiency of tyrosinase.