Table 4.

Results of the likelihood ratio tests for different models of codon evolution and estimated parameter values

Model	lnL	ΔAIC	Parameters
	Group 1
M0 – one ω	−2975.2	454.8	ω = 0.53
M7 – nearly neutral with β	−2788.9	100.2
M8 – positive selection with β (ω0 ≤ 1, ω1 >1)	−2737.8	Best	p0 = 0.83, p1 = 0.17, ω1 = 2.92
	Group 2
M0 – one ω	−1154.5	68.5	ω = 0.74
M7 – nearly neutral with β	−1124	25.5
M8 – positive selection with β (ω0 ≤ 1, ω1 >1)	−1110.2	Best	p0 = 0.93, p1 = 0.07, ω1 = 5.26

ω - dN/dS; nearly neutral with β - for all sites dN/dS ≤ 1 and the beta distribution approximates ω variation; positive selection - a proportion of sites evolves with dN/dS > 1; lnL - Log-likelihood value; ΔAIC - the difference between the value of the AIC of a given model and the best model; p₀ - proportion of sites with dN/dS ≤ 1, p₁ - proportion of positively selected sites (dN/dS > 1), ω₁ - estimated value of ω for sites under positive selection.