Fig. 2
From: Comparative transcriptome reveal the potential adaptive evolutionary genes in Andrias davidianus
Ka/Ks ratio of 1244 single-copy orthologous genes. a. Ka/Ks distribution in Andrias davidianus and Hynobius chinensis, b. Ka/Ks distribution in Andrias davidianus and Notophthalmus viridescens. The solid line shows the threshold of Ka/Ks = 1, the dashed line marked the weak positive selection threshold of Ka/Ks = 0.5, and the short dashed line represented threshold of Ka/Ks = 0.1