3.4.23.1	pepsin A	-	
3.4.23.10	endothia acid proteinase	transferred to EC 3.4.23.22	
3.4.23.11	thyroid aspartic proteinase	deleted	
3.4.23.12	nepenthesin	-	
3.4.23.13	Lotus aspartic proteinase	deleted	
3.4.23.14	sorghum aspartic proteinase	deleted	
3.4.23.15	renin	-	
3.4.23.16	HIV-1 retropepsin	-	
3.4.23.17	Pro-opiomelanocortin converting enzyme	-	
3.4.23.18	Aspergillopepsin I	-