Mid-point rooted phylogenetic tree of CSP (A) and OBP (B) sequences from Tribolium castaneum (green branches), Drosophila melanogaster (red branches), and Anopheles gambiae (blue branches). Outer rings represent the expression in antennae and ‘mouthparts’ (Tribolium: palps, mandible, labrum and labium; Drosophila: palp and proboscis; Anopheles: maxillary palp) as log2 fold change compared to body corresponding to the scale in the right middle. The scale bars within the trees represent 1 amino acid substitution per site. Inner ring in B indicates the phylogenetic subclass (classic in black, ABPII in grey, C-OBP in green, C + OBP in blue, D7 in yellow, Dimer in red). Numbers on branches show values of 100 times replication bootstrap analysis higher than 70.