Table 1. Selective pressure analyses on RH1 gene.

Model	P	Ln L	Estimates of parameters
M0: one ratio	61	−5362.243336	ω = 0.0291
Two ratio:
The common ancestor of bats	62	−5362.046108	ωb = 0.0163, ω0 = 0.0294
The common ancestor of bats ωb = 1	61	−5372.736900	ω0 = 0.0289
Megabats	62	−5362.159966	ωm = 0.0225, ω0 = 0.0293
Megabats ωm = 1	61	−5380.586595	ω0 = 0.0286
Site models (only contain bats)
M1a	41	−2376.845476	p:	0.98192	0.01808
			ω:	0.01635	1.00000
M2a	43	−2376.845476	p:	0.98192	0.01130	0.00678
			ω:	0.01635	1.00000	1.00000
M8	43	−2372.427477		Pr(ω>1)	post mean +− SE for ω
			123 I	0.652	1.397+−0.850
			217 I	0.662	1.396+−0.839
M8a	42	−2372.416062	p0 = 0.98890	p = 0.10800	q = 4.35638
			(p1 = 0.01110)	ω = 1.00000
Branch-site models
The common ancestor of bats	64	−5322.454355	site class	0	1	2a	2b
			proportion	0.96419	0.03581	0.00000	0.00000
			background ω	0.02195	1.00000	0.02195	1.00000
			foreground ω	0.02195	1.00000	1.00000	1.00000
The common ancestor of bats ωb = 1	63	−5322.454355	site class	0	1	2a	2b
			proportion	0.96419	0.03581	0.00000	0.00000
			background ω	0.02195	1.00000	0.02195	1.00000
			foreground ω	0.02195	1.00000	1.00000	1.00000
Megabats	64	−5322.454355	site class	0	1	2a	2b
			proportion	0.96419	0.03581	0.00000	0.00000
			background ω	0.02195	1.00000	0.02195	1.00000
			foreground ω	0.02195	1.00000	1.00000	1.00000
Megabats ωm = 1	63	−5322.454355	site class	0	1	2a	2b
			proportion	0.96419	0.03581	0.00000	0.00000
			background ω	0.02195	1.00000	0.02195	1.00000
			foreground ω	0.02195	1.00000	1.00000	1.00000