Table 2. Comparison of base composition among three regions.

Species	Regions	MFE (kcal/mol)	Base Composition				tAI
			A	T	G	C
ECO	FAR	−22.25 (7.55)	0.131 (0.072 a)	0.231 (0.092)	0.355 (0.105)	0.284 (0.093)	0.250 (0.033)
	HSR	−25.21 (7.73)	0.107 (0.068)	0.195 (0.088)	0.412 (0.106)	0.285 (0.088)	0.255 (0.033)
	BAR	−22.23 (7.47)	0.136 (0.075)	0.229 (0.096)	0.359 (0.108)	0.277 (0.089)	0.249 (0.034)
EFE	FAR	−21.57 (7.13)	0.151 (0.076)	0.252 (0.095)	0.333 (0.104)	0.264 (0.088)	0.282 (0.039)
	HSR	−24.73 (7.68)	0.130 (0.074)	0.213 (0.088)	0.385 (0.108)	0.271 (0.084)	0.286 (0.039)
	BAR	−20.94 (7.08)	0.155 (0.081)	0.249 (0.092)	0.332 (0.104)	0.263 (0.085)	0.280 (0.039)

^aThe standard deviations are shown in parentheses.