1. Oxidoreductases

 2. Transferases

   2.1  Transferring one-carbon groups

   2.2  Transferring aldehyde or ketonic groups

   2.3  Acyltransferases

   2.4  Glycosyltransferases

   2.5  Transferring alkyl or aryl groups, other than methyl groups

   2.6  Transferring nitrogenous groups

   2.7  Transferring phosphorus-containing groups

   2.8  Transferring sulfur-containing groups

     2.8.1  Sulfurtransferases

     2.8.2  Sulfotransferases

       2.8.2.1  aryl sulfotransferase

       2.8.2.2  alcohol sulfotransferase

       2.8.2.3  amine sulfotransferase

       2.8.2.4  estrone sulfotransferase

       2.8.2.5  chondroitin 4-sulfotransferase

       2.8.2.6  choline sulfotransferase

       2.8.2.7  UDP-N-acetylgalactosamine-4-sulfate sulfotransferase

       2.8.2.8  [heparan sulfate]-glucosamine N-sulfotransferase

       2.8.2.9  tyrosine-ester sulfotransferase

       2.8.2.10  Renilla-luciferin sulfotransferase

       2.8.2.11  galactosylceramide sulfotransferase

       2.8.2.13  psychosine sulfotransferase

       2.8.2.14  bile-salt sulfotransferase

       2.8.2.15  steroid sulfotransferase

       2.8.2.16  thiol sulfotransferase

       2.8.2.17  chondroitin 6-sulfotransferase

       2.8.2.18  cortisol sulfotransferase

       2.8.2.19  triglucosylalkylacylglycerol sulfotransferase

       2.8.2.20  protein-tyrosine sulfotransferase

       2.8.2.21  keratan sulfotransferase

       2.8.2.22  aryl-sulfate sulfotransferase

       2.8.2.23  [heparan sulfate]-glucosamine 3-sulfotransferase 1

       2.8.2.24  aromatic desulfoglucosinolate sulfotransferase

       2.8.2.25  flavonol 3-sulfotransferase

       2.8.2.26  quercetin-3-sulfate 3'-sulfotransferase

       2.8.2.27  quercetin-3-sulfate 4'-sulfotransferase

       2.8.2.28  quercetin-3,3'-bissulfate 7-sulfotransferase

       2.8.2.29  [heparan sulfate]-glucosamine 3-sulfotransferase 2

       2.8.2.30  [heparan sulfate]-glucosamine 3-sulfotransferase 3

       2.8.2.31  petromyzonol sulfotransferase

       2.8.2.32  scymnol sulfotransferase

       2.8.2.33  N-acetylgalactosamine 4-sulfate 6-O-sulfotransferase

       2.8.2.34  glycochenodeoxycholate sulfotransferase

       2.8.2.35  dermatan 4-sulfotransferase

       2.8.2.36  desulfo-A47934 sulfotransferase

       2.8.2.37  trehalose 2-sulfotransferase

       2.8.2.38  aliphatic desulfoglucosinolate sulfotransferase

       2.8.2.39  hydroxyjasmonate sulfotransferase

       2.8.2.40  omega-hydroxy-beta-dihydromenaquinone-9 sulfotransferase

     2.8.3  CoA-transferases

     2.8.4  Transferring alkylthio groups

     2.8.5  Thiosulfotransferases

   2.9  Transferring selenium-containing groups

   2.10  Transferring molybdenum- or tungsten-containing groups

 3. Hydrolases

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases