Parameters estimates and log-likelihood for models MA and MA null and contrast between models MA and MA null by likelihood ratio test (LRT).

ω0 = dN/dS for sites with 0ωω1 = dN/dS for sites with ω = 1; ω2 = dN/dS for sites with ω>1. p0 = proportion of sites with ω0; p1 = proportion of sites with ω1; (p2+p3) = proportion of sites with ω2; All such parameters correspond only to foreground branches. The LRT critical values at 5% and 1% level are 2.71(*) and 5.41(**), respectively. Site numbers in boldface are at the common region.