Additional file 3: Figure S1. of Adaptive genomic evolution of opsins reveals that early mammals flourished in nocturnal environments BorgesRui JohnsonWarren O’BrienStephen GomesCidália HeesyChristopher AntunesAgostinho 2018 Species-specific evolutionary rate for mammalian opsins. ω-lineages were standardized subtracting the median and divided by the interquartile range. Coloured circles correspond to the species subjected to branch selection tests and significant results are indicated with an asterisk (*). (PDF 501 kb)