1.8.98.1	dihydromethanophenazine:CoB-CoM heterodisulfide reductase	-	
1.8.98.2	sulfiredoxin	-	
1.8.98.3	sulfite reductase (coenzyme F420)	-	
1.8.98.4	coenzyme F420:CoB-CoM heterodisulfide,ferredoxin reductase	-	
1.8.98.5	H2:CoB-CoM heterodisulfide,ferredoxin reductase	-	
1.8.98.6	formate:CoB-CoM heterodisulfide,ferredoxin reductase	-	
1.8.98.7	cysteine-type anaerobic sulfatase-maturating enzyme	-	
1.8.99.1	sulfite reductase	deleted, now covered by EC 1.8.1.2, assimilatory sulfite reductase (NADPH) and EC 1.8.7.1, assimilatory sulfite reductase (ferredoxin).	
1.8.99.2	adenylyl-sulfate reductase	-	
1.8.99.3	hydrogensulfite reductase	deleted, now known to be an in vitro artifact of EC 1.8.99.5, dissimilatory sulfite reductase