Fig. 4.
From: The round goby genome provides insights into mechanisms that may facilitate biological invasions
Phylogenetic tree of percomorph olfactory receptor protein sequences. a Phylogenetic relationship among five analyzed percomorph species, i.e., three gobiids (Neogobius melanostomus, Boleophthalmus pectinirostris, Periophthalmodon magnuspinatus), one cichlid (Oreochromis niloticus), and one stickleback (Gasterosteus aculeatus). b Maximum likelihood phylogenetic tree constructed with adrenergic receptors as outgroup. Sequences were identified de novo except for nile tilapia (Oreochromis niloticus; blue). Branches magnified in c and d are highlighted with gray boxes. An expanded view of the tree is available as Additional file 4: Figure S3. c Branch of the 7tm4 family featuring large independent expansions in all species analyzed. d Branch of the 7tm1 family featuring several expansions in Gobiidae (red, orange) that are not paralleled in other percomorph species (blue)