1.12.99.1	coenzyme F420 hydrogenase	transferred to EC 1.12.98.1	
1.12.99.2	coenzyme-M-7-mercaptoheptanoylthreonine-phosphate-heterodisulfide hydrogenase	deleted, this was a system comprising two enzymes and not a single enzyme, as was thought	
1.12.99.3	hydrogen:quinone oxidoreductase	transferred to EC 1.12.5.1	
1.12.99.4	N5,N10-methenyltetrahydromethanopterin hydrogenase	transferred to EC 1.12.98.2	
1.12.99.5	3,4-dihydroxyquinoline 2,4-dioxygenase	deleted, identical to EC 1.13.11.47	
1.12.99.6	hydrogenase (acceptor)	-