-ENZREV 2.1.2.5 4.3.1.3 -ENZIRREV 1.4.3.6 2.1.1.22 2.1.1.8 2.1.2.5 3.5.1.15 3.5.2.7 4.1.1.28 4.2.1.49 4.3.1.3 -METINT RCH2NH2 O2 RCHO NH3 H2O2 S-Adenosyl-L-methionine carnosine S-adenosyl-L-homocysteine anserine histamine Ntau-methylhistamine 5-Formiminotetrahydrofolate L-glutamate tetrahydrofolate N-formimino-L-glutamate N-Acetyl-L-aspartate a_fatty_acid_anion L-aspartate 4-Imidazolone-5-propanoate L-Tryptophan tryptamine CO2 Urocanate 4,5-dihydro-4-oxo-5-imidazolepropanoate L-Histidine urocanate -METEXT H2O -CAT 1.4.3.6 : RCH2NH2 + H2O + O2 = RCHO + NH3 + H2O2 . 2.1.1.22 : S-Adenosyl-L-methionine + carnosine = S-adenosyl-L-homocysteine + anserine . 2.1.1.8 : S-Adenosyl-L-methionine + histamine = S-adenosyl-L-homocysteine + Ntau-methylhistamine . 2.1.2.5 : 5-Formiminotetrahydrofolate + L-glutamate = tetrahydrofolate + N-formimino-L-glutamate . 3.5.1.15 : N-Acetyl-L-aspartate + H2O = a_fatty_acid_anion + L-aspartate . 3.5.2.7 : 4-Imidazolone-5-propanoate + H2O = N-formimino-L-glutamate . 4.1.1.28 : L-Tryptophan = tryptamine + CO2 . 4.2.1.49 : Urocanate + H2O = 4,5-dihydro-4-oxo-5-imidazolepropanoate . 4.3.1.3 : L-Histidine = urocanate + NH3 .