Melatonin is synthesised from: (A) Tryptophan, (B) Serotonin, (C) Phenyllanine, (D) Histidine
Answer is A. Tryptophan is conveed to Seratonin, which is acetylated. Fuher methylated with the help of S-adenosyl methionine to form Methionine.Ref: DM Vasudevan - Textbook of Biochemistry for Medical Students, 7th edition, page no: 241