synthase EC 4.2.1.21: Now cystathionine β-synthase : cystathionine β-synthase EC 4.2.1.23: deleted, the reaction was due to a side-reaction of cystathionine β-synthase : porphobilinogen synthase : L-arabinonate dehydratase EC 4.2.1.26: identical to , glucosaminate ammonia-lyase : acetylenecarboxylate hydratase : propanediol dehydratase EC 4.2.1.29: Now , indoleacetaldoxime dehydratase : glycerol dehydratase : maleate hydratase : L(+)-tartrate dehydratase : 3-isopropylmalate dehydratase : (S)-2-methylmalate dehydratase : (R)-2-methylmalate dehydratase : homoaconitate hydratase EC 4.2.1.37: Now , trans-epoxysuccinate hydrolase EC 4.2.1.38: Now , erythro-3-hydroxyaspartate ammonia-lyase : gluconate dehydratase : glucarate dehydratase : 5-dehydro-4-deoxyglucarate dehydratase : galactarate dehydratase : 2-dehydro-3-deoxy-L-arabinonate dehydratase : myo-inosose-2 dehydratase : CDP-glucose 4,6-dehydratase : dTDP-glucose 4,6-dehydratase : GDP-mannose 4,6-dehydratase : D-glutamate cyclase : urocanate hydratase : pyrazolylalanine synthase : prephenate dehydratase EC 4.2.1.52: Now , 4-hydroxy-2,3,4,5-tetrahydrodipicolinate synthase. : oleate hydratase : lactoyl-CoA dehydratase : 3-hydroxybutyryl-CoA dehydratase : itaconyl-CoA hydratase : isohexenylglutaconyl-CoA hydratase EC 4.2.1.58: The reaction described is covered by : 3-hydroxyacyl-[acyl-carrier-protein] dehydratase EC 4.2.1.60: 3-hydroxydecanoyl-(acyl-carrier-protein) dehydratase EC 4.2.1.61: The reaction described is covered by . : 5α-hydroxysteroid dehydratase EC 4.2.1.63: Now known to comprise two enzymes, microsomal epoxide hydrolase () and soluble epoxide hydrolase () EC 4.2.1.64: Now known to comprise two enzymes, microsomal epoxide hydrolase () and soluble epoxide hydrolase () : 3-cyanoalanine hydratase : cyanide hydratase : D-fuconate dehydratase : L-fuconate dehydratase : cyanamide hydratase : pseudouridylate synthase EC 4.2.1.71: identical to , acetylenecarboxylate hydratase EC 4.2.1.72: Now , acetylenedicarboxylate decarboxylase : protoaphin-aglucone dehydratase (cyclizing) : long-chain-enoyl-CoA hydratase : uroporphyrinogen-III synthase : UDP-glucose 4,6-dehydratase : trans-L-3-hydroxyproline dehydratase : (S)-norcoclaurine synthase : 2-methylcitrate dehydratase : 2-oxopent-4-enoate hydratase : D(-)-tartrate dehydratase : xylonate dehydratase : 4-oxalmesaconate hydratase : nitrile hydratase : dimethylmaleate hydratase EC 4.2.1.86: identical to , 16α-hydroxyprogesterone dehydratase : octopamine dehydratase : synephrine dehydratase EC 4.2.1.89: The activity has now been shown to be due to , L-carnitine CoA-transferase and , crotonobetainyl-CoA hydratase : L-rhamnonate dehydratase : arogenate dehydratase : hydroperoxide dehydratase : ATP-dependent NAD(P)H-hydrate dehydratase : scytalone dehydratase : kievitone hydratase : 4a-hydroxytetrahydrobiopterin dehydratase : phaseollidin hydratase : 16α-hydroxyprogesterone dehydratase : 2-methylisocitrate dehydratase : cyclohexa-1,5-dienecarbonyl-CoA hydratase EC 4.2.1.101: Now included with , feruloyl-CoA hydratase/lyase EC 4.2.1.102: Now , cyclohexa-1,5-dienecarbonyl-CoA hydratase : cyclohexyl-isocyanide hydratase : cyanase : 2-hydroxyisoflavanone dehydratase : bile-acid 7α-dehydratase : 3α,7α,12α-trihydroxy-5β-cholest-24-enoyl-CoA hydratase : ectoine synthase : methylthioribulose 1-phosphate dehydratase : aldos-2-ulose dehydratase : 1,5-anhydro-D-fructose dehydratase : acetylene hydratase : o-succinylbenzoate synthase : methanogen homoaconitase : UDP-N-acetylglucosamine 4,6-dehydratase (configuration-inverting) : 3-hydroxypropionyl-CoA dehydratase : 2-methylcitrate dehydratase (2-methyl-trans-aconitate forming)