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

<p>−2Δ<i>L</i>, likelihood ratio test to detect positive selection with 1 degree of freedom; Foreground 1: <i>H. Sapiens</i> B3, <i>P. Troglodytes</i> B3 and <i>G. Gorilla</i> B3 lineages; Foreground 2: <i>H. Sapiens</i> B4, <i>P. Troglodytes</i> B4 and <i>G. Gorilla</i> 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.</p><p>** Significance with p<0.01.