Table 2.

Protease-related genes in selected microorganisms.

Species	ATP-dependent proteases	ATP-independent proteases	Peptidases	Total
Thermotoga maritima	9	14	16	39
Pyrococcus furiosus	5	13	22	40
Pyrococcus abyssi	5	9	20	34
Pyrococcus horikoshii	5	9	20	34
Archaeoglobus fulgidus	4	7	11	22
Sulfolobus solfataricus	4	13	16	33
Escherichia coli	13	16	31	60