1. Oxidoreductases

 2. Transferases

 3. Hydrolases

 4. Lyases

   4.1  Carbon-carbon lyases

     4.1.1  Carboxy-lyases

     4.1.2  Aldehyde-lyases

     4.1.3  Oxo-acid-lyases

     4.1.99  Other carbon-carbon lyases

       4.1.99.1  tryptophanase

       4.1.99.2  tyrosine phenol-lyase

       4.1.99.3  deoxyribodipyrimidine photo-lyase

       4.1.99.5  aldehyde oxygenase (deformylating)

       4.1.99.11  benzylsuccinate synthase

       4.1.99.12  3,4-dihydroxy-2-butanone-4-phosphate synthase

       4.1.99.13  (6-4)DNA photolyase

       4.1.99.14  spore photoproduct lyase

       4.1.99.16  geosmin synthase

       4.1.99.17  phosphomethylpyrimidine synthase

       4.1.99.19  2-iminoacetate synthase

       4.1.99.20  3-amino-4-hydroxybenzoate synthase

       4.1.99.22  GTP 3',8-cyclase

       4.1.99.23  5-hydroxybenzimidazole synthase

       4.1.99.24  L-tyrosine isonitrile synthase

       4.1.99.25  L-tryptophan isonitrile synthase

       4.1.99.26  3-amino-5-[(4-hydroxyphenyl)methyl]-4,4-dimethylpyrrolidin-2-one synthase

       4.1.99.27  cyclopenase

       4.1.99.28  3'-dehydrocarminate deglycosidase

       4.1.99.29  5,8-dihydroxy-2-naphthoate synthase

   4.2  Carbon-oxygen lyases

   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