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	
1.8.99.4	phosphoadenosine-phosphosulfate reductase	transferred to EC 1.8.4.8	
1.8.99.5	dissimilatory sulfite reductase	-	
1.8.99.B1	protein-disulfide reductase (acceptor)	preliminary BRENDA-supplied EC number	
1.8.99.B2	tetrathionate reductase	preliminary BRENDA-supplied EC number