highly significantp < 10 −17
We found highly significant evidence of positive selection acting on Avian GSTA2 ( p < 10 −17 ; M8 PAML, Supplementary Table 9 ) and identified with high statistical confidence (posterior probabilities >0.99) several GSTA2 sites targeted by this acceleration in evolutionary rates ( d N / d S = 3.50; Fig. 4a ).