Fig. 1
From: Characterization of the melanopsin gene (Opn4x) of diurnal and nocturnal snakes
Phylogenetic reconstruction of vertebrate melanopsin genes Opn4m and Opn4x, by Maximum Likelihood (ML). Snake melanopsin sequences (gray box) correspond to the Opn4x gene. The amphioxus melanopsin sequence (GenBank: Q4R1I4) was used as outgroup (not shown). ML bootstrap supports are indicated for each resolved node. The scale bar represents the number of nucleotide substitutions per site