4.6.1.19	ribonuclease T2	-	
4.6.1.2	guanylate cyclase	-	
4.6.1.20	ribonuclease U2	-	
4.6.1.21	Enterobacter ribonuclease	-	
4.6.1.22	Bacillus subtilis ribonuclease	-	
4.6.1.23	ribotoxin	-	
4.6.1.24	ribonuclease T1	-	
4.6.1.25	bacteriophage T4 restriction endoribonuclease RegB	-	
4.6.1.26	uridylate cyclase	-	
4.6.1.3	3-dehydroquinate synthase	transferred to EC 4.2.3.4