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4.2.1.1 carbonic anhydrase

4.2.1.2 fumarate hydratase

4.2.1.3 aconitate hydratase

4.2.1.4 citrate dehydratase

4.2.1.5 Arabinonate dehydratase

4.2.1.6 galactonate dehydratase

4.2.1.7 altronate dehydratase

4.2.1.8 mannonate dehydratase

4.2.1.9 dihydroxy-acid dehydratase

4.2.1.10 3-dehydroquinate dehydratase

4.2.1.11 phosphopyruvate hydratase

4.2.1.12 phosphogluconate dehydratase

4.2.1.13 L-serine dehydratase

4.2.1.14 D-serine dehydratase

4.2.1.15 homoserine dehydratase

4.2.1.16 threonine dehydratase

4.2.1.17 enoyl-CoA hydratase

4.2.1.18 methylglutaconyl-CoA hydratase

4.2.1.19 imidazoleglycerol-phosphate dehydratase

4.2.1.20 tryptophan synthase

4.2.1.21 cystathionine beta-synthase

4.2.1.22 cystathionine beta-synthase

4.2.1.23 methylcysteine synthase

4.2.1.24 porphobilinogen synthase

4.2.1.25 L-Arabinonate dehydratase

4.2.1.26 aminodeoxygluconate dehydratase

4.2.1.27 acetylenecarboxylate hydratase

4.2.1.28 propanediol dehydratase

4.2.1.29 indoleacetaldoxime dehydratase

4.2.1.30 glycerol dehydratase

4.2.1.31 maleate hydratase

4.2.1.32 L(+)-tartrate dehydratase

4.2.1.33 3-isopropylmalate dehydratase

4.2.1.34 (S)-2-methylmalate dehydratase

4.2.1.35 (R)-2-methylmalate dehydratase

4.2.1.36 homoaconitate hydratase

4.2.1.37 trans-epoxysuccinate hydratase

4.2.1.38 erythro-3-hydroxyaspartate dehydratase

4.2.1.39 gluconate dehydratase

4.2.1.40 glucarate dehydratase

4.2.1.41 5-dehydro-4-deoxyglucarate dehydratase

4.2.1.42 galactarate dehydratase

4.2.1.43 2-dehydro-3-deoxy-L-arabinonate dehydratase

4.2.1.44 myo-inosose-2 dehydratase

4.2.1.45 CDP-glucose 4,6-dehydratase

4.2.1.46 dTDP-glucose 4,6-dehydratase

4.2.1.47 GDP-mannose 4,6-dehydratase

4.2.1.48 D-glutamate cyclase

4.2.1.49 urocanate hydratase

4.2.1.50 pyrazolylalanine synthase

4.2.1.51 prephenate dehydratase

4.2.1.52 dihydrodipicolinate synthase

4.2.1.53 oleate hydratase

4.2.1.54 lactoyl-CoA dehydratase

4.2.1.55 3-hydroxybutyryl-CoA dehydratase

4.2.1.56 itaconyl-CoA hydratase

4.2.1.57 Isohexenylglutaconyl-CoA hydratase

4.2.1.58 crotonoyl-[acyl-carrier-protein] hydratase

4.2.1.59 3-hydroxyacyl-[acyl-carrier-protein] dehydratase

4.2.1.60 3-hydroxydecanoyl-[acyl-carrier-protein] dehydratase

4.2.1.61 3-hydroxypalmitoyl-[acyl-carrier-protein] dehydratase

4.2.1.62 5alpha-Hydroxysteroid dehydratase

4.2.1.63 epoxide hydratase

4.2.1.64 arene-oxide hydratase

4.2.1.65 3-Cyanoalanine hydratase

4.2.1.66 cyanide hydratase

4.2.1.67 D-fuconate dehydratase

4.2.1.68 L-fuconate dehydratase

4.2.1.69 cyanamide hydratase

4.2.1.70 pseudouridylate synthase

4.2.1.71 acetylenecarboxylate hydratase

4.2.1.72 acetylenedicarboxylate hydratase

4.2.1.73 protoaphin-aglucone dehydratase (cyclizing)

4.2.1.74 medium-chain-enoyl-CoA hydratase

4.2.1.75 uroporphyrinogen-III synthase

4.2.1.76 UDP-glucose 4,6-dehydratase

4.2.1.77 trans-L-3-hydroxyproline dehydratase

4.2.1.78 (S)-norcoclaurine synthase

4.2.1.79 2-methylcitrate dehydratase

4.2.1.80 2-oxopent-4-enoate hydratase

4.2.1.81 D(-)-tartrate dehydratase

4.2.1.82 xylonate dehydratase

4.2.1.83 4-oxalomesaconate hydratase

4.2.1.84 nitrile hydratase

4.2.1.85 dimethylmaleate hydratase

4.2.1.86 16-dehydroprogesterone hydratase

4.2.1.87 octopamine dehydratase

4.2.1.88 synephrine dehydratase

4.2.1.89 carnitine dehydratase

4.2.1.90 L-rhamnonate dehydratase

4.2.1.91 arogenate dehydratase

4.2.1.92 hydroperoxide dehydratase

4.2.1.93 ATP-dependent NAD(P)H-hydrate dehydratase

4.2.1.94 scytalone dehydratase

4.2.1.95 kievitone hydratase

4.2.1.96 4a-hydroxytetrahydrobiopterin dehydratase

4.2.1.97 phaseollidin hydratase

4.2.1.98 16alpha-hydroxyprogesterone dehydratase

4.2.1.99 2-methylisocitrate dehydratase

4.2.1.100 cyclohexa-1,5-dienecarbonyl-CoA hydratase

4.2.1.101 trans-feruloyl-CoA hydratase

4.2.1.102 cyclohexa-1,5-dienecarbonyl-CoA hydratase

4.2.1.103 cyclohexyl-isocyanide hydratase

4.2.1.104 cyanase

4.2.1.105 2-hydroxyisoflavanone dehydratase

4.2.1.106 bile-acid 7alpha-dehydratase

4.2.1.107 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase

4.2.1.108 ectoine synthase

4.2.1.109 methylthioribulose 1-phosphate dehydratase

4.2.1.110 aldos-2-ulose dehydratase

4.2.1.111 1,5-anhydro-D-fructose dehydratase

4.2.1.112 acetylene hydratase

4.2.1.113 o-succinylbenzoate synthase

4.2.1.114 methanogen homoaconitase

4.2.1.115 UDP-N-acetylglucosamine 4,6-dehydratase (configuration-inverting)

4.2.1.116 3-hydroxypropionyl-CoA dehydratase

4.2.1.117 2-methylcitrate dehydratase (2-methyl-trans-aconitate-forming)

4.2.1.118 3-dehydroshikimate dehydratase

4.2.1.119 enoyl-CoA hydratase 2

4.2.1.120 4-hydroxybutanoyl-CoA dehydratase

4.2.1.121 colneleate synthase

4.2.1.122 tryptophan synthase (indole-salvaging)

4.2.1.123 tetrahymanol synthase

4.2.1.124 arabidiol synthase

4.2.1.125 dammarenediol II synthase

4.2.1.126 N-acetylmuramic acid 6-phosphate etherase

4.2.1.127 linalool dehydratase

4.2.1.128 lupan-3beta,20-diol synthase

4.2.1.129 squalene-hopanol cyclase

4.2.1.130 D-lactate dehydratase

4.2.1.131 carotenoid 1,2-hydratase

4.2.1.132 2-hydroxyhexa-2,4-dienoate hydratase

4.2.1.133 copal-8-ol diphosphate hydratase

4.2.1.134 very-long-chain (3R)-3-hydroxyacyl-CoA dehydratase

4.2.1.135 UDP-N-acetylglucosamine 4,6-dehydratase (configuration-retaining)

4.2.1.136 ADP-dependent NAD(P)H-hydrate dehydratase

4.2.1.137 sporulenol synthase

4.2.1.138 (+)-caryolan-1-ol synthase

4.2.1.139 pterocarpan synthase

4.2.1.140 gluconate/galactonate dehydratase

4.2.1.141 2-dehydro-3-deoxy-D-arabinonate dehydratase

4.2.1.142 5'-oxoaverantin cyclase

4.2.1.143 versicolorin B synthase

4.2.1.144 3-amino-5-hydroxybenzoate synthase

4.2.1.145 capreomycidine synthase

4.2.1.146 L-galactonate dehydratase

4.2.1.147 5,6,7,8-tetrahydromethanopterin hydro-lyase

4.2.1.148 2-methylfumaryl-CoA hydratase

4.2.1.149 crotonobetainyl-CoA hydratase

4.2.1.150 short-chain-enoyl-CoA hydratase

4.2.1.151 chorismate dehydratase

4.2.1.152 hydroperoxy icosatetraenoate dehydratase

4.2.1.153 3-methylfumaryl-CoA hydratase

4.2.1.154 tetracenomycin F2 cyclase

4.2.1.155 (methylthio)acryloyl-CoA hydratase

4.2.1.156 L-talarate dehydratase

4.2.1.157 (R)-2-hydroxyisocaproyl-CoA dehydratase

4.2.1.158 galactarate dehydratase (D-threo-forming)

4.2.1.159 dTDP-4-dehydro-6-deoxy-alpha-D-glucopyranose 2,3-dehydratase

4.2.1.160 2,5-diamino-6-(5-phospho-D-ribosylamino)pyrimidin-4(3H)-one isomerase/dehydratase

4.2.1.161 bisanhydrobacterioruberin hydratase

4.2.1.162 6-deoxy-6-sulfo-D-gluconate dehydratase

4.2.1.163 2-oxo-hept-4-ene-1,7-dioate hydratase

4.2.1.164 dTDP-4-dehydro-2,6-dideoxy-D-glucose 3-dehydratase

4.2.1.165 chlorophyllide a 31-hydratase

4.2.1.166 phosphinomethylmalate isomerase

4.2.1.167 (R)-2-hydroxyglutaryl-CoA dehydratase

4.2.1.168 GDP-4-dehydro-6-deoxy-alpha-D-mannose 3-dehydratase

4.2.1.169 3-vinyl bacteriochlorophyllide d 31-hydratase

4.2.1.170 2-(omega-methylthio)alkylmalate dehydratase

4.2.1.171 cis-L-3-hydroxyproline dehydratase

4.2.1.172 trans-4-hydroxy-L-proline dehydratase

4.2.1.173 ent-8alpha-hydroxylabd-13-en-15-yl diphosphate synthase

4.2.1.174 peregrinol diphosphate synthase

4.2.1.175 (R)-3-(aryl)lactoyl-CoA dehydratase

4.2.1.176 L-lyxonate dehydratase

4.2.1.177 (2S)-3-sulfopropanediol dehydratase

4.2.1.178 difructose-dianhydride-III synthase

4.2.1.179 difructose-anhydride-I synthase

4.2.1.180 (E)-benzylidenesuccinyl-CoA hydratase

4.2.1.181 3-carboxymethyl-3-hydroxy-acyl-[acp] dehydratase

4.2.1.182 phosphomevalonate dehydratase

4.2.1.183 etheroleic acid synthase

4.2.1.184 (3S)-3-hydroxy-D-aspartate dehydratase

4.2.1.185 6-deoxy-6-sulfo-D-galactonate dehydratase

4.2.1.186 3-cyano-L-homoalanine synthase

4.2.1.B5 omega5(Z)-etheroleic acid synthase

4.2.1.B6 (11Z)-etheroleic acid synthase

4.2.1.B7 (8Z)-colneleic acid synthase

4.2.1.B8 etheroleic acid synthase

4.2.1.B9 colneleic acid/etheroleic acid synthase

4.2.1.B20 onoceroid synthase

4.2.1.B22 galactarate dehydratase (2-oxo-D-threo-4,5-dihydroadipate)

4.2.1.B26 (R)-2-hydroxyglutaryl-CoA dehydratase

4.2.1.B27 2-nitro-1-(4-nitrophenyl)ethanol synthase

4.2.1.B28 tetrahymanol synthase (hopene)

4.2.1.B29 vermelone dehydratase