<prompt> Serotonin is produced from?TryptophanPhenylalanineTyrosineMelatonin  <response>: Ans. a Tryptophan. Ref. Harper, Biochemistry, 25thpg.352AMINOACIDDERIVATIVESPhenylalaninePhenylalanine - tyrosine - dopa - norepinephrine - epinephrine.Phenylalanine - tyrosine - dopa - dopamine - Melanin.Phenylalanine - tyrosine - Thyroxine.Tryptophani Niacinii Serotoniniii Melatonindegiv 5-HIAAHistidineHistamine By decarboxylation0ErgothionineCarnosineAnserineGlycinePorphyrin and haeme,PurinesCreatine totally madeup of glycine arginine methionine--GAMGlutathione totally made up of glycine cystine glutamateGlychocholic acid Hippuric acidArginineCarnitineUreaCreatinePutrescineSpermine and spermidineNitric oxide a NT, vasodilator and smooth muscle relaxantMethionineCholineSpermine and spermidineb-alanineCysteineCoACarnosineCysteineCoATaurine 