BMC Ecology and Evolution

Table 1 Model Parameter Estimates, dN/dS Ratios, Log Likelihood Values and Test Statistics for PAML Site Models.

From: Evidence of positive selection at codon sites localized in extracellular domains of mammalian CC motif chemokine receptor proteins

Gene	Model	Parameters	*dN/dS*	p	l	*2Δl*
CCR2	M7: Neutral, beta	p = 0.33949, q = 1.05276	0.2417	2	-4931.71
	M8: Selection, beta + ω	p₀ = 0.97570, p = 0.45144	0.2728	4	-4924.10	M7 vs. M8: 15.22***
		q = 1.67059, (p₁ = 0.02430)
		ω = 2.83526
CCR3	M1a: Nearly Neutral	ω₀ = 0.07487, ω₁ = 1.00	0.4314	2	-5536.21
		p₀ = 0.61460, (p₁ = 0.38540)
	M2a: Selection	ω₀ = 0.07422, ω₁ = 1.00	0.5014	4	-5526.29	M1a vs. M2a: 19.84***
		ω₂ = 5.44115, p₀ = 0.60315
		p₁ = 0.38339, (p₂ = 0.01346)
CCR3	M7: Neutral, beta	p = 0.22415, q = 0.35810	0.3850	2	-5534.05
	M8: Selection, beta + ω	p₀ = 0.98363, p = 0.23871	0.2662	4	-5522.90	M7 vs. M8: 22.30***
		q = 0.3298, (p₁ = 0.01637)
		ω = 4.50735

The test statistic 2Δl is compared to a χ² distribution with 2 degrees of freedom, critical values 5.99, 9.21, and 13.82 at 5%, 1%, and 0.1% significance, respectively. Significant results are indicated by asterisks. Values for non-significant comparisons are presented in Additional File 1.

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