Table 2. Distribution of constrained genes in endosymbiotic bacteria of aphids (Buch) and carpenter ants (Bloc) among the functional categories classified using COG.

Category	Sub-category	#Genes		# Genes R(ω)<1		%Genes
		Buch	Bloc	Buch	Bloc	Buch	Bloc
Met	C	40	42	12	5	30.0	11.9
	G	19	28	6	4	31.6	14.3
	E	47	58	21	11	44.7	18.9
	F	20	23	4	2	20.0	8.7
	H	25	34	5	4	20.0	11.8
	I	10	25	3	4	33.0	16.0
	P	12	19	6	7	50.0	36.8
CPS	D	8	13	2	1	25.0	7.8
	O	33	28	13	4	39.4	14.3
	M	17	48	4	7	23.5	14.6
	N	23	0	2	0	8.7	0.0
	T	4	4	1	0	25.0	0.0
	U	10	13	3	1	33.0	7.7
	V	3	2	0	0	0.0	0.0
ISP	J	82	106	41	29	50.0	27.4
	K	14	16	8	3	57.0	18.8
	L	31	31	9	7	29.0	22.6