1. Oxidoreductases

 2. Transferases

 3. Hydrolases

 4. Lyases

   4.1  Carbon-carbon lyases

   4.2  Carbon-oxygen lyases

     4.2.1  Hydro-lyases

     4.2.2  Acting on polysaccharides

     4.2.3  Acting on phosphates

     4.2.99  Other carbon-oxygen lyases

       4.2.99.12  carboxymethyloxysuccinate lyase

       4.2.99.18  DNA-(apurinic or apyrimidinic site) lyase

       4.2.99.20  2-succinyl-6-hydroxy-2,4-cyclohexadiene-1-carboxylate synthase

       4.2.99.21  isochorismate lyase

       4.2.99.22  tuliposide A-converting enzyme

       4.2.99.23  tuliposide B-converting enzyme

       4.2.99.24  thebaine synthase

       4.2.99.25  unsaturated pyranuronate lyase

   4.3  Carbon-nitrogen lyases

   4.4  Carbon-sulfur lyases

   4.5  Carbon-halide lyases

   4.6  Phosphorus-oxygen lyases

   4.7  carbon-phosphorus lyases

   4.8  Nitrogen-oxygen lyases

   4.98  ATP-independent chelatases

   4.99  Other lyases

 5. Isomerases

 6. Ligases

 7. Translocases