1. Oxidoreductases

 2. Transferases

 3. Hydrolases

 4. Lyases

   4.1  Carbon-carbon lyases

   4.2  Carbon-oxygen lyases

   4.3  Carbon-nitrogen lyases

     4.3.1  Ammonia-lyases

     4.3.2  Amidine-lyases

       4.3.2.1  argininosuccinate lyase

       4.3.2.2  adenylosuccinate lyase

       4.3.2.3  ureidoglycolate lyase

       4.3.2.4  purine imidazole-ring cyclase

       4.3.2.5  peptidylamidoglycolate lyase

       4.3.2.6  gamma-L-glutamyl-butirosin B gamma-glutamyl cyclotransferase

       4.3.2.7  glutathione-specific gamma-glutamylcyclotransferase

       4.3.2.8  gamma-glutamylamine cyclotransferase

       4.3.2.9  gamma-glutamylcyclotransferase

       4.3.2.10  imidazole glycerol-phosphate synthase

       4.3.2.11  (3R)-3-[(carboxylmethyl)amino]fatty acid synthase

     4.3.3  Amine-lyases

     4.3.99  Other 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