This article lists enzymes by their classification in the International Union of Biochemistry and Molecular Biology's Enzyme Commission (EC) numbering system. List of EC numbers (EC 5) List of EC numbers (EC 6) :Category:Oxidoreductases (EC 1) (Oxidoreductase) Dehydrogenase Luciferase DMSO reductase :Category:EC 1.1 (act on the CH-OH group of donors) :Category:EC 1.1.1 (with NAD+ or NADP+ as acceptor) Alcohol dehydrogenase (NAD) Alcohol dehydrogenase (NADP) Homoserine dehydrogenase Aminopropanol oxidoreductase Diacetyl reductase Glycerol dehydrogenase Propanediol-phosphate dehydrogenase glycerol-3-phosphate dehydrogenase (NAD+) D-xylulose reductase L-xylulose reductase Lactate dehydrogenase Malate dehydrogenase Isocitrate dehydrogenase HMG-CoA reductase :Category:EC 1.1.2 (with a cytochrome as acceptor) :Category:EC 1.1.3 (with oxygen as acceptor) Glucose oxidase L-gulonolactone oxidase Thiamine oxidase Xanthine oxidase :Category:EC 1.1.4 (with a disulfide as acceptor) :Category:EC 1.1.5 (with a quinone or similar compound as acceptor) :Category:EC 1.1.99 (with other acceptors) :Category:EC 1.2 (act on the aldehyde or oxo group of donors) :Category:EC 1.2.1 (with NAD+ or NADP+ as acceptor) Acetaldehyde dehydrogenase Glyceraldehyde 3-phosphate dehydrogenase Pyruvate dehydrogenase :Category:EC 1.2.4 Oxoglutarate dehydrogenase :Category:EC 1.3 (act on the CH-CH group of donors) :Category:EC 1.3.1 (with NAD+ or NADP+ as acceptor) Biliverdin reductase :Category:EC 1.3.2 (with a cytochrome as acceptor) :Category:EC 1.3.3 (with oxygen as acceptor) Protoporphyrinogen oxidase :Category:EC 1.3.5 (with a quinone or similar compound as acceptor) :Category:EC 1.3.7 (with an iron–sulfur protein as acceptor) :Category:EC 1.3.99 (with other acceptors) :Category:EC 1.4 (act on the CH-NH2 group of donors) :Category:EC 1.4.3 Monoamine oxidase :Category:EC 1.5 (act on CH-NH group of donors) :Category:EC 1.5.1 (with NAD+ or NADP+ as acceptor) Dihydrofolate reductase Methylenetetrahydrofolate reductase :Category:EC 1.5.3 (with oxygen as acceptor) Sarcosine oxidase Dihydrobenzophenanthridine oxidase :Category:EC 1.5.4 (with a disulfide as acceptor) :Category:EC 1.5.5 (with a quinone or similar compound as acceptor) :Category:EC 1.5.7 (with an iron–sulfur protein as acceptor) :Category:EC 1.5.8 (with a flavin as acceptor) :Category:EC 1.5.99 (with other acceptors) :Category:EC 1.6 (act on NADH or NADPH) :Category:EC 1.6.1 (with NAD+ or NADP+ as acceptor) :Category:EC 1.6.2 (with a cytochrome as acceptor) :Category:EC 1.6.3 (with oxygen as acceptor) Category:EC 1.6.4 now :Category:EC 1.8.1 :Category:EC 1.6.5 (with a quinone or similar compound as acceptor) NADH dehydrogenase :Category:EC 1.6.6 (with a nitrogenous group as acceptor) Category:EC 1.6.7 now :Category:EC 1.18.1 Category:EC 1.6.8 now :Category:EC 1.5.1 :Category:EC 1.6.99 (with other acceptors) :Category:EC 1.7 (act on other nitrogenous compounds as donors) :Category:EC 1.7.1 (with NAD+ or NADP+ as acceptor) :Category:EC 1.7.2 (with a cytochrome as acceptor) :Category:EC 1.7.3 (with oxygen as acceptor) Urate oxidase :Category:EC