1.12.1.1	peroxidase	transferred to EC 1.18.99.1	
1.12.1.2	hydrogen dehydrogenase	-	
1.12.1.3	hydrogen dehydrogenase (NADP+)	-	
1.12.1.4	hydrogenase (NAD+, ferredoxin)	-	
1.12.1.5	hydrogen dehydrogenase [NAD(P)+]	-	
1.12.2.1	cytochrome-c3 hydrogenase	-	
1.12.5.1	hydrogen:quinone oxidoreductase	-	
1.12.7.1	ferredoxin hydrogenase	transferred to EC 1.18.99.1	
1.12.7.2	ferredoxin hydrogenase	-	
1.12.98.1	coenzyme F420 hydrogenase	-