Melatonin is synthesised from
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
Tryptophan
Serotonin
Phenyllanine
Histidine
Metabolism of protein and amino acid