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Neighbor-Joining phylogenetic tree for 36 group β genes identified in this study with all (387) human functional OR genes. Bootstrap values were obtained from 500 replications and are shown for the clades with >70% bootstrap values (in clade β) and for major clades. Species names are colored in the same manner as figure 1B. The number of amino acid sites used was 232. Names of group β genes are provided in supplementary data set 3 (Supplementary Material online).
