1. Oxidoreductases
2. Transferases
3. Hydrolases
3.1 Acting on ester bonds
3.2 Glycosylases
3.3 Acting on ether bonds
3.4 Acting on peptide bonds (peptidases)
3.4.11 Aminopeptidases
3.4.13 Dipeptidases
3.4.14 Dipeptidyl-peptidases and tripeptidyl-peptidases
3.4.15 Peptidyl-dipeptidases
3.4.16 Serine-type carboxypeptidases
3.4.17 Metallocarboxypeptidases
3.4.18 Cysteine-type carboxypeptidases
3.4.19 Omega peptidases
3.4.21 Serine endopeptidases
3.4.21.1 chymotrypsin
3.4.21.2 chymotrypsin C
3.4.21.3 metridin
3.4.21.4 trypsin
3.4.21.5 thrombin
3.4.21.6 coagulation factor Xa
3.4.21.7 plasmin
3.4.21.9 enteropeptidase
3.4.21.10 acrosin
3.4.21.12 alpha-lytic endopeptidase
3.4.21.19 glutamyl endopeptidase
3.4.21.20 cathepsin G
3.4.21.21 coagulation factor VIIa
3.4.21.22 coagulation factor IXa
3.4.21.25 cucumisin
3.4.21.26 prolyl oligopeptidase
K01322 PREP; prolyl oligopeptidase [EC:3.4.21.26]
3.4.21.27 coagulation factor XIa
3.4.21.32 brachyurin
3.4.21.34 plasma kallikrein
3.4.21.35 tissue kallikrein
3.4.21.36 pancreatic elastase
3.4.21.37 leukocyte elastase
3.4.21.38 coagulation factor XIIa
3.4.21.39 chymase
3.4.21.41 complement subcomponent C_overbar_1r_
3.4.21.42 complement subcomponent C_overbar_1s_
3.4.21.43 classical-complement-pathway C3/C5 convertase
3.4.21.45 complement factor I
3.4.21.46 complement factor D
3.4.21.47 alternative-complement-pathway C3/C5 convertase
3.4.21.48 cerevisin
3.4.21.49 hypodermin C
3.4.21.50 lysyl endopeptidase
3.4.21.53 endopeptidase La
3.4.21.54 gamma-renin
3.4.21.55 venombin AB
3.4.21.57 leucyl endopeptidase
3.4.21.59 tryptase
3.4.21.60 scutelarin
3.4.21.61 kexin
3.4.21.62 subtilisin
3.4.21.63 oryzin
3.4.21.64 peptidase K
3.4.21.65 thermomycolin
3.4.21.66 thermitase
3.4.21.67 endopeptidase So
3.4.21.68 t-plasminogen activator
3.4.21.69 protein C (activated)
3.4.21.70 pancreatic endopeptidase E
3.4.21.71 pancreatic elastase II
3.4.21.72 IgA-specific serine endopeptidase
3.4.21.73 u-plasminogen activator
3.4.21.74 venombin A
3.4.21.75 furin
3.4.21.76 myeloblastin
3.4.21.77 semenogelase
3.4.21.78 granzyme A
3.4.21.79 granzyme B
3.4.21.80 streptogrisin A
3.4.21.81 streptogrisin B
3.4.21.82 glutamyl endopeptidase II
3.4.21.83 oligopeptidase B
3.4.21.84 limulus clotting factor _overbar_C_
3.4.21.85 limulus clotting factor _overbar_B_
3.4.21.86 limulus clotting enzyme
3.4.21.88 repressor LexA
3.4.21.89 signal peptidase I
3.4.21.90 togavirin
3.4.21.91 flavivirin
3.4.21.92 endopeptidase Clp
3.4.21.93 proprotein convertase 1
3.4.21.94 proprotein convertase 2
3.4.21.95 snake venom factor V activator
3.4.21.96 lactocepin
3.4.21.97 assemblin
3.4.21.98 hepacivirin
3.4.21.99 spermosin
3.4.21.100 sedolisin
3.4.21.101 xanthomonalisin
3.4.21.102 C-terminal processing peptidase
3.4.21.103 physarolisin
3.4.21.104 mannan-binding lectin-associated serine protease-2
3.4.21.105 rhomboid protease
3.4.21.106 hepsin
3.4.21.107 peptidase Do
3.4.21.108 HtrA2 peptidase
3.4.21.109 matriptase
3.4.21.110 C5a peptidase
3.4.21.111 aqualysin 1
3.4.21.112 site-1 protease
3.4.21.113 pestivirus NS3 polyprotein peptidase
3.4.21.114 equine arterivirus serine peptidase
3.4.21.115 infectious pancreatic necrosis birnavirus Vp4 peptidase
3.4.21.116 SpoIVB peptidase
3.4.21.117 stratum corneum chymotryptic enzyme
3.4.21.118 kallikrein 8
3.4.21.119 kallikrein 13
3.4.21.120 oviductin
3.4.21.121 Lys-Lys/Arg-Xaa endopeptidase
3.4.21.122 transmembrane protease serine 2
3.4.21.123 kumamolysin
3.4.22 Cysteine endopeptidases
3.4.23 Aspartic endopeptidases
3.4.24 Metalloendopeptidases
3.4.25 Threonine endopeptidases
3.4.26 Glutamic endopeptidases
3.5 Acting on carbon-nitrogen bonds, other than peptide bonds
3.6 Acting on acid anhydrides
3.7 Acting on carbon-carbon bonds
3.8 Acting on halide bonds
3.9 Acting on phosphorus-nitrogen bonds
3.10 Acting on sulfur-nitrogen bonds
3.11 Acting on carbon-phosphorus bonds
3.12 Acting on sulfur-sulfur bonds
3.13 Acting on carbon-sulfur bonds
4. Lyases
5. Isomerases
6. Ligases
7. Translocases