Likelihood ratio test for branch-site model for SERPINB3/B4 phylogeny.

−2ΔL, likelihood ratio test to detect positive selection with 1 degree of freedom; Foreground 1: H. Sapiens B3, P. Troglodytes B3 and G. Gorilla B3 lineages; Foreground 2: H. Sapiens B4, P. Troglodytes B4 and G. Gorilla B4 lineages. Amino acid sites found to be under positive selection with posterior probabilities greater than 80% (blank) are displayed; NA, not applicable because the neutral model fits better than positive selection.** Significance with p