<prompt> Niacin is derived from which amino acid -TyrosinePhenylalanineTryptophanMethionine  <response>: Ans. is c i.e., TryptophanAmino acidsBiological important compoundTyrosineCatecholamines epinephrine, norepinephrine, dopamine, thyroxine,triiodothryonine, melaninNote : - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosinejJ-lipotropic hormone b-LPH phenylalanine - Tyrosine - Catecholamines, thyroxine T., melanin.TryptophanVitamin niacin, melatonin. SerotoninGlycine,Arginine, methionineCreatineGlycine, cysteineBile saltsGlycineHemeAspartic acid and glutaminePyrimidine basesGlycine, aspartic acid, glutaminePurine basesb-alanineCoenzyme-AArginineNitric oxideHistidine, Arginine, lysineKeratinMethionine, lysineCarnitineGABAGlutamateGlutamate, cysteine, glycineGlutathione 