Table 3. Comparison of null and alternative models by LRT and positively selected sites estimated by Bayes Empirical Bayes.

Test	Contrast	LRT	D.F.	χ2- Probability	Positively selected sites
Relaxed branch-site	M1a MA	25.20	2	p < 7.7x10-7
Strict branch-site	Restricted MA MA	12.41	1	p < 0.001	85, 94, 109, 192, 257, 311

LRT - likelihood ratio test; D.F - Degrees of freedom.