Figure 6. Protein topology of D. nigrosparsa receptors under positive selection.
The predicted topologies of odorant, gustatory, and ionotropic receptors, showing distribution of non-synonymous substitutions (β > α > 0) on conserved residues (see methods, Figure S4) between D. nigrosparsa and the 12 Drosophila species (blue circles) and conserved cysteines (orange circles) along protein domains. Seven trans-membrane domains were inferred for ORs and GRs, three for IRs.