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1 Oxidoreductases
(8635 organisms)
1.1 Acting on the CH-OH group of donors
(6131 organisms)
1.2 Acting on the aldehyde or oxo group of donors
(1172 organisms)
1.3 Acting on the CH-CH group of donors
(937 organisms)
1.4 Acting on the CH-NH
2
group of donors
(957 organisms)
1.5 Acting on the CH-NH group of donors
(657 organisms)
1.6 Acting on NADH or NADPH
(348 organisms)
1.7 Acting on other nitrogenous compounds as donors
(490 organisms)
1.8 Acting on a sulfur group of donors
(640 organisms)
1.9 Acting on a heme group of donors
(240 organisms)
1.10 Acting on diphenols and related substances as donors
(456 organisms)
1.11 Acting on a peroxide as acceptor
(718 organisms)
1.12 Acting on hydrogen as donor
(257 organisms)
1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)
(703 organisms)
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
(1911 organisms)
1.15 Acting on superoxide as acceptor
(316 organisms)
1.16 Oxidizing metal ions
(165 organisms)
1.17 Acting on CH or CH
2
groups
(248 organisms)
1.18 Acting on iron-sulfur proteins as donors
(171 organisms)
1.19 Acting on reduced flavodoxin as donor
(20 organisms)
1.20 Acting on phosphorus or arsenic in donors
(83 organisms)
1.21 Catalysing the reaction X-H + Y-H = X-Y
(122 organisms)
1.22 Acting on halogen in donors
1.23 Reducing C-O-C group as acceptor
(29 organisms)
1.97 Other oxidoreductases
(57 organisms)
1.98 Enzymes using H
2
as reductant (deleted subclass)
1.99 Other enzymes using O
2
as oxidant (deleted subclass)
2 Transferases
(6570 organisms)
3 Hydrolases
(9662 organisms)
4 Lyases
(4229 organisms)
5 Isomerases
(1640 organisms)
6 Ligases
(1310 organisms)