Table 2.

Comparison of proteins in COGs for archaeal species

Species* COGs	Genome size (Mb)	ORFs		Percentage of ORFs in COGs
		Total	in COGs
Af	2.18	2,411	1,755	73
Mj	1.74	1,747	1,252	72
Mth	1.75	1,871	1,339	72
Ph	1.74	2,072	1,333	64
Pa	1.77	1,765	1,404	79
Ap	1.67	2,694	1,102	41
Ap†	1.67	1,873	1,129	60

^*For abbreviations see the Materials and methods section. ^†After adjusting for new ORFs and removal of likely false ORFs. This adjusted number of genes is the upper estimate of the actual total number of genes in A. pernix.