Figure 3

Maximum-likelihood phylogenetic analysis of sauropsid olfactory receptor genes. (a) Analysis includes the Cory’s Shearwater’s 220 OR genes aligned with 98 Northern fulmar genes from GenBank, 134 zebra finch genes, 214 chicken genes, and 112 green anole genes (from [8]). (b) Analysis using only the set of complete genes from the Cory’s Shearwater (n = 20), aligned with 44 full fulmar genes (from GenBank), 134 zebra finch genes, 214 chicken genes, and 112 green anole genes (from [8]). Both analyses are based on the JTT model as the best fitting substitution model. Outgroup sequences of the Adenosine receptor A2b are from GenBank. Nodal support values are shown for major clades.