Table 1.

Peptidase families where active site residues are not known or are uncertain.

Family	Type example
A5	thermopsin
A37	sso1175 protein
C49	strawberry mottle virus peptidase
C84	prtH peptidase
C95	lysosomal 66.3 kDa protein
C102	GtgE peptidase
M73	camelysin
M75	imelysin
M76	Atp23 peptidase
M77	tryptophanyl aminopeptidase 7-DMATS-type peptidase
M79	RCE1 peptidase
M82	PrsW peptidase
M98	YghJ protein
S46	dipeptidyl-peptidase 7
S62	influenza A PA peptidase
S68	PIDD auto-processing protein unit 1
T8	HopB1 protein
U32	Porphyromonas collagenase
U40	protein P5 murein endopeptidase
U49	Lit peptidase
U56	homomultimeric peptidase
U57	yabG protein
U69	AIDA-I self-cleaving autotransporter protein
U72	Dop isopeptidase
U74	neprosin