Melatonin is derived from: (A) Tyrosine, (B) Tryptophan, (C) Glutathione, (D) None
Answer is B. Tryptophan is first hydroxylated by tryptophan Hydroxylase 5-hydroxytryptophan is decarboxylated to serotoninSerotonin is acetylated Fuher methylated with the help of S adenosylmethionine (SAM)Ref: DM Vasudevan, 7th edition, page no: 241, fig 18.10