Location of Cluster-Specific Amino Acids on the Molecular Surface of Hox Homeodomains. The homeodomain is shown with the molecular surface in red and DNA in gray. Cluster-specific amino acids are shown in blue and amino acids that were under positive selection after cluster duplications are shown in yellow. Only those sites with a posterior probability larger than 0.90 of having ω > 1 are shown in yellow.
Lynch et al. BMC Evolutionary Biology 2006 6:86 doi:10.1186/1471-2148-6-86