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

       4.3.1.1  aspartate ammonia-lyase

       4.3.1.2  methylaspartate ammonia-lyase

       4.3.1.3  histidine ammonia-lyase

       4.3.1.4  formimidoyltetrahydrofolate cyclodeaminase

       4.3.1.6  beta-alanyl-CoA ammonia-lyase

       4.3.1.7  ethanolamine ammonia-lyase

       4.3.1.9  glucosaminate ammonia-lyase

       4.3.1.10  serine-sulfate ammonia-lyase

       4.3.1.12  ornithine cyclodeaminase

       4.3.1.13  carbamoyl-serine ammonia-lyase

       4.3.1.14  3-aminobutyryl-CoA ammonia-lyase

       4.3.1.15  diaminopropionate ammonia-lyase

       4.3.1.16  threo-3-hydroxy-L-aspartate ammonia-lyase

       4.3.1.17  L-serine ammonia-lyase

       4.3.1.18  D-serine ammonia-lyase

       4.3.1.19  threonine ammonia-lyase

       4.3.1.20  erythro-3-hydroxy-L-aspartate ammonia-lyase

       4.3.1.22  3,4-dihydroxyphenylalanine reductive deaminase

       4.3.1.23  tyrosine ammonia-lyase

       4.3.1.24  phenylalanine ammonia-lyase

       4.3.1.25  phenylalanine/tyrosine ammonia-lyase

       4.3.1.27  threo-3-hydroxy-D-aspartate ammonia-lyase

       4.3.1.28  L-lysine cyclodeaminase

       4.3.1.29  D-glucosaminate-6-phosphate ammonia-lyase

       4.3.1.30  dTDP-4-amino-4,6-dideoxy-D-glucose ammonia-lyase

       4.3.1.31  L-tryptophan ammonia lyase

       4.3.1.32  7,8-didemethyl-8-hydroxy-5-deazariboflavin synthase

       4.3.1.33  (R)-1-hydroxy-2-aminoethylphosphonate ammonia-lyase

     4.3.2  Amidine-lyases

     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