esng: Ensembl gene ID
Cargill_p_possel: p-value of positive selection from Cargill et al. (Ka/Ks test)
Bustamante_possel: p-value of positive selection from Bustamante et al. (McDonald-Kreitmann test)
Bustamante_gamma: gamma value of positive selection from Bustamante et al. (McDonald Kreitman test)
clarkp-vale: p-value of positive selection from Clark et al. (Ka/Ks test)
clark_dnds: dN/dS ratio from Clark et al.
Moyzis_yesno: Positive selection according to Moyzis et al. (LDD test)
Cargill_LR: Likelihood ratio of positive selection from Cargill et al. (Ka/Ks etst)