Table 1.

Parameters of the branch-site models used for the detection of positive selection

Model	Loge L	Parameters
Null	−17 119.9710	p0 = 0.8158, p1 = 0.0466, p2a = 0.1302, p2b = 0.0074
		Background: ω0 = 0.0471, ω1 = 1.0000, ω2a = 0.0471, ω2b = 1.0000
		Foreground: ω0 = 0.0471, ω1 = 1.0000, ω2a = 1.0000, ω2b = 1.0000
Alternative	−17 112.9058**	p0 = 0.7947, p1 = 0.0455, p2a = 0.1511, p2b = 0.0087
		Background: ω0 = 0.0485, ω1 = 1.0000, ω2a = 0.0485, ω2b = 1.0000
		Foreground: ω0 = 0.0485, ω1 = 1.0000, ω2a = 48.9623, ω2b = 48.9623

**, P < 0.01.