Figure 1. Positively selected genes identified in the four bird taxa (Strigifomres, Coraciimorphae, Falconiformes and Accipitriformes).
The positively selected genes based on the branch model, branch-site model and the clade model are shown in red, blue and black, respectively. The species phylogenetic relationships are based on previous studies1,49,50,51. The 15 species under the transcriptome sequencing are highlighted in green, and their corresponding pictures are shown in the same order as that of their species names. The 11 species with vision gene data cited from GenBank are shown in black with no pictures.