1.20.1.1	phosphonate dehydrogenase	-	
1.20.2.1	arsenate reductase (cytochrome c)	-	
1.20.4.1	arsenate reductase (glutathione/glutaredoxin)	-	
1.20.4.2	methylarsonate reductase	-	
1.20.4.3	mycoredoxin	-	
1.20.4.4	arsenate reductase (thioredoxin)	-	
1.20.9.1	arsenate reductase (azurin)	-	
1.20.98.1	arsenate reductase (azurin)	transferred to EC 1.20.9.1	
1.20.99.1	arsenate reductase (donor)	-