<prompt> Serotonin is derived fromTyrosineTryptophanPhenylalanineMethionine  <response>: Serotonin is a metabolite of tryptophan Tryptophan ---5hydroxy tryptophan ---5hyroxy tryptamine serotonin Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 241 