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	-	
3.4.23.19	Aspergillopepsin II	-	
3.4.23.2	pepsin B	-	
3.4.23.20	Penicillopepsin	-	
3.4.23.21	Rhizopuspepsin	-	
3.4.23.22	Endothiapepsin	-	
3.4.23.23	Mucorpepsin	-	
3.4.23.24	Candidapepsin	-	
3.4.23.25	saccharopepsin	-	
3.4.23.26	Rhodotorulapepsin	-	
3.4.23.27	physaropepsin	transferred to EC 3.4.21.103	
3.4.23.28	Acrocylindropepsin	-	
3.4.23.29	Polyporopepsin	-	
3.4.23.3	gastricsin	-	
3.4.23.30	Pycnoporopepsin	-	
3.4.23.31	Scytalidopepsin A	-	
3.4.23.32	Scytalidopepsin B	-	
3.4.23.33	xanthomonapepsin	transferred to EC 3.4.21.101	
3.4.23.34	cathepsin E	-	
3.4.23.35	Barrierpepsin	-	
3.4.23.36	Signal peptidase II	-	
3.4.23.37	pseudomonapepsin	transferred to EC 3.4.21.100	
3.4.23.38	plasmepsin I	-	
3.4.23.39	plasmepsin II	-	
3.4.23.4	chymosin	-	
3.4.23.40	Phytepsin	-	
3.4.23.41	yapsin 1	-	
3.4.23.42	thermopsin	-	
3.4.23.43	prepilin peptidase	-	
3.4.23.44	nodavirus endopeptidase	-	
3.4.23.45	memapsin 1	-	
3.4.23.46	memapsin 2	-	
3.4.23.47	HIV-2 retropepsin	-	
3.4.23.48	plasminogen activator Pla	-	
3.4.23.49	omptin	-	
3.4.23.5	cathepsin D	-	
3.4.23.50	human endogenous retrovirus K endopeptidase	-	
3.4.23.51	HycI peptidase	-	
3.4.23.52	preflagellin peptidase	-	
3.4.23.6	microbial carboxyl proteinases	deleted, included in EC 3.4.23.18-28, EC 3.4.23.30	
3.4.23.7	Penicillium janthinellum acid proteinase	transferred to EC 3.4.23.20	
3.4.23.8	yeast proteinase A	transferred to EC 3.4.23.25	
3.4.23.9	rhizopus acid proteinase	transferred to EC 3.4.23.21	
3.4.23.B1	napsin	preliminary BRENDA-supplied EC number	
3.4.23.B10	Rous sarcoma virus retropepsin	preliminary BRENDA-supplied EC number	
3.4.23.B11	spumapepsin	preliminary BRENDA-supplied EC number	
3.4.23.B13	proteinase P15	preliminary BRENDA-supplied EC number	
3.4.23.B14	plasmepsin IV	preliminary BRENDA-supplied EC number	
3.4.23.B17	walleye dermal sarcoma virus proteinase	preliminary BRENDA-supplied EC number	
3.4.23.B18	mouse mammary tumor virus retropepsin	preliminary BRENDA-supplied EC number	
3.4.23.B19	plasmepsin V	preliminary BRENDA-supplied EC number	
3.4.23.B2	Simian immunodeficiency virus proteinase	preliminary BRENDA-supplied EC number	
3.4.23.B20	HycD peptidase	preliminary BRENDA-supplied EC number	
3.4.23.B24	signal peptide peptidase	preliminary BRENDA-supplied EC number	
3.4.23.B25	thermopsin-like protease SSO1175	preliminary BRENDA-supplied EC number	
3.4.23.B3	equine infectious anemia virus proteinase	preliminary BRENDA-supplied EC number	
3.4.23.B4	Feline immunodeficiency virus protease	preliminary BRENDA-supplied EC number	
3.4.23.B5	murine leukemia virus protease	preliminary BRENDA-supplied EC number	
3.4.23.B6	Mason-Pfizer monkey virus proteinase	preliminary BRENDA-supplied EC number	
3.4.23.B8	human T-cell leukemia virus type 1 protease	preliminary BRENDA-supplied EC number	
3.4.23.B9	bovine leukemia virus protease	preliminary BRENDA-supplied EC number