Structural evolution of CatSper1 in rodents is influenced by sperm competition, with effects on sperm swimming velocity

Table 1 Tests of positive selection in CatSper1

N	Ls	Best fit model	Log-likelihood values^a	Parameter estimates	PSS^b
16	235	M1a	-2907.9808	p₀ = 0.269, p₁ = 0.731, ω₀ = 0.027, ω₁ = 1	Not allowed
		M2a	-2879.567332 **	p₀ = 0.186, p₁ = 0.651 p₂ = 0.163, ω₀ = 0, ω₁ = 1, ω₂ = 4.67	124H, 128H, 146S, 147 T, 154H, 165S, 179 L, 198 T, 201A, 204Q*
		M7	-2908.013308	p = 0.041, q = 0.012	Not allowed
		M8	-2879.676624 **	p₀ = 0.833, p = 0.0166, q =0.0052, p₁ = 0.166, ω = 4.535	124H, 146S, 147 T, 154H, 165S, 179 L, 198 T, 201A, 204Q**
		M8a	-2907.982933	p₀ = 0.269, p = 2.758, q = 99.0, p₁ = 0.731, ω = 1.0	Not allowed

^aDifferences between log-likelihood values of models with 99% statistical significance level for 2 degrees of freedom are shown as **.
^bPositively selected sites (PSS) with a posterior probability >0.95 (*) and >0.99 (**) in Bayes Empirical Bayes.
N, Number of sequences aligned.
Ls, Sequence length (in codons) after alignment gaps are removed.
Parameter estimation and likelihood scores under site models.

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