Table 8.

Other peptidase families possibly present in LUCA. The following peptidase families are present in all kingdoms but not found within most phyla in some kingdoms. These may have been present in LUCA and subsequently lost in some phyla.

Family	Type example	Kingdoms with few represented phyla
C26	gamma-glutamyl carboxypeptidase	Chromista
C44	amidophosphoribosyltransferase precursor	Fungi, Chromista
M14	carboxypeptidase A	Archaea
M16	pitrilysin	Archaea
M28	aminopeptidase Y	Chromista
M38	beta-aspartyl dipeptidase	Fungi
M50	S2P endopeptidase	Fungi
M79	RCE1 peptidase	Fungi
S15	Xaa-Pro dipeptidyl peptidase	Animalia, Viridiplantae (absent from Streptophyta), Fungi, Chromista, Protozoa
S33	prolyl aminopeptidase	Chromista
T2	asparaginase	Protozoa
T3	gamma glutamyl transpeptidase	Protozoa, Archaea