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1 Oxidoreductases
(9652 organisms)
2 Transferases
(6548 organisms)
3 Hydrolases
(9645 organisms)
3.1 Acting on ester bonds
(3418 organisms)
3.2 Glycosylases
(3992 organisms)
3.3 Acting on ether bonds
(158 organisms)
3.4 Acting on peptide bonds (peptidases)
(2016 organisms)
3.5 Acting on carbon-nitrogen bonds, other than peptide bonds
(2069 organisms)
3.6 Acting on acid anhydrides
(886 organisms)
3.7 Acting on carbon-carbon bonds
(140 organisms)
3.8 Acting on halide bonds
(157 organisms)
3.9 Acting on phosphorus-nitrogen bonds
(12 organisms)
3.9.1 Acting on phosphorus-nitrogen bonds (only sub-subclass identified to date)
(12 organisms)
3.10 Acting on sulfur-nitrogen bonds
(8 organisms)
3.11 Acting on carbon-phosphorus bonds
(49 organisms)
3.12 Acting on sulfur-sulfur bonds
(19 organisms)
3.13 Acting on carbon-sulfur bonds
(38 organisms)
3.13.1 Acting on carbon-sulfur bonds (only sub-subclass identified to date)
(38 organisms)
4 Lyases
(4284 organisms)
5 Isomerases
(1661 organisms)
6 Ligases
(1518 organisms)
7 Translocases
(404 organisms)