Figure 2

Maximum-likelihood tree of iGluRs/IRs. The distance tree was rooted by the conservative IR25a/IR8a gene orthologous. Species abbreviations: Gmel, Galleria mellonella; Bmor, Bombyx mori; Cmed, Cnaphalocrocis medinalis; Cpom, Cydia pomonella; Epos, Epiphyas postvittana; Msex, Manduca sexta; Snon, Sesamia nonagrioides; Dmel, Drosophila melanogaster. Highlighted clades: non-N-Methyl-D-aspartic acid (purple), iGluRs (orange), antennal IRs (green) and divergent IRs (blue). Node support (circles at the branch nodes) was estimated using an approximate likelihood ratio test based on the scale indicated at the top left. Bars indicate branch lengths in proportion to amino acid substitutions per site.