Table 2. Genes, which are under significant positive selection, from the amino acid metabolism pathways.

Gene	Q-value	Pathway	Description
rcoR	0.0000	Arginine Metabolism	Regulatory protein in arginine utilization
kbl	0.0000	Glycine, serine and threonine Metabolism	Glycine C-acetyltransferase
asd	0.0000	Lysine Metabolism	Aspartate-semialdehyde dehydrogenase
		Cysteine & Methionine Metabolism
		Glycine & Serine & Threonine Metabolism
trmA	0.0067	Histidine Metabolism	tRNA (uracil-5-)-methyltransferase
hisD	0.0142	Histidine Metabolism	Histidinol dehydrogenase
tcyA	0.0301	Amino-acid transporter system	Cystine ABC transporter
mtnE	0.0375	Cysteine & Methionine Metabolism	Transaminase