Results of two-ratio model tests of selection pressure on the Tat gene in bats.

aSee Figure 1B for branch labels.bnp, number of parameters.cωFix (ωA, ωB, ωC, ωD, ωE and ωF) and ω0, are the ω ratios for branches A, B, C, D, E, F and other branches, respectively.dThe P-value of each test was multiplied by six (tested branches) to correct for multiple testing.