Pervasive adaptive evolution of MAVS in primates.

M7 is a null model in which dN/dS (ω)>1 is not allowed. M7 assumes 01 in likelihood ratio tests. These comparisons support evolution of MAVS under positive selection in primates. Models M0 and M1 are free-ratio models that are compared to test for branch-specific positive selection. M0 model allows all branches to have the same common ω, while M1 allows each branch to have its own ω. This comparison does not support episodic selection of MAVS in primates. All analyses were done using codeml program in PAML software.