Fig. 4
From: Type 1 vomeronasal receptor expression in juvenile and adult lungfish olfactory organ
Phylogenetic tree of V1R genes of four lungfish. The names of the sequences are as follows: Pae, P. aethiopicus; Lpa, L. paradoxa; Pan, P. annectens; Pam, P. amphibius; Ola, medaka; Gac, stickleback; Dre, zebrafish; Lch, coelacanth; Xtr, tropical clawed frog; and Bta, cow. Newly identified lungfish V1Rs are indicated in blue (P. aethiopicus) and orange (L. paradoxa). Scale bars indicate the number of amino acid substitutions per site. T2Rs (bitter-taste receptors) were used as the outgroup. Bootstrap values higher than 80 were shown only for major nodes of the phylogenetic tree. Tetrapod-type and fish-type V1Rs are indicated by dotted and double lines, respectively