1. Oxidoreductases

   1.1  Acting on the CH-OH group of donors

   1.2  Acting on the aldehyde or oxo group of donors

   1.3  Acting on the CH-CH group of donors

   1.4  Acting on the CH-NH2 group of donors

   1.5  Acting on the CH-NH group of donors

   1.6  Acting on NADH or NADPH

   1.7  Acting on other nitrogenous compounds as donors

   1.8  Acting on a sulfur group of donors

     1.8.1  With NAD+ or NADP+ as acceptor

       1.8.1.2  assimilatory sulfite reductase (NADPH)

       1.8.1.4  dihydrolipoyl dehydrogenase

       1.8.1.5  2-oxopropyl-CoM reductase (carboxylating)

       1.8.1.6  cystine reductase

       1.8.1.7  glutathione-disulfide reductase

       1.8.1.8  protein-disulfide reductase

       1.8.1.9  thioredoxin-disulfide reductase

       1.8.1.10  CoA-glutathione reductase

       1.8.1.11  asparagusate reductase

       1.8.1.12  trypanothione-disulfide reductase

       1.8.1.13  bis-gamma-glutamylcystine reductase

       1.8.1.14  CoA-disulfide reductase

       1.8.1.15  mycothione reductase

       1.8.1.16  glutathione amide reductase

       1.8.1.17  dimethylsulfone reductase

       1.8.1.18  NAD(P)H sulfur oxidoreductase (CoA-dependent)

       1.8.1.19  sulfide dehydrogenase

       1.8.1.20  4,4'-dithiodibutanoate disulfide reductase

       1.8.1.21  dissimilatory dimethyldisulfide reductase

       1.8.1.22  dissimilatory sulfite reductase system

     1.8.2  With a cytochrome as acceptor

     1.8.3  With oxygen as acceptor

     1.8.4  With a disulfide as acceptor

     1.8.5  With a quinone or similar compound as acceptor

     1.8.7  With an iron-sulfur protein as acceptor

     1.8.98  With other, known, physiological acceptors

     1.8.99  With unknown physiological acceptors

   1.9  Acting on a heme group of donors

   1.10  Acting on diphenols and related substances as donors

   1.11  Acting on a peroxide as acceptor

   1.12  Acting on hydrogen as donor

   1.13  Acting on single donors with incorporation of molecular oxygen (oxygenases)

   1.14  Acting on paired donors, with incorporation or reduction of molecular oxygen

   1.15  Acting on superoxide as acceptor

   1.16  Oxidizing metal ions

   1.17  Acting on CH or CH2 groups

   1.18  Acting on iron-sulfur proteins as donors

   1.19  Acting on reduced flavodoxin as donor

   1.20  Acting on phosphorus or arsenic in donors

   1.21  Catalysing the reaction X-H + Y-H = X-Y

   1.23  Reducing C-O-C group as acceptor

   1.97  Other oxidoreductases

 2. Transferases

 3. Hydrolases

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases