Secondary structure and positively selected sites for four partially sequenced Astatotilapia burtoni Dlx proteins. Secondary structure predictions were obtained from the PSIPRED server (http://bioinf.cs.ucl.ac.uk/psipred/). Positively selected sites identified by the site model analyses (CodeML) and the SLR analyses are highlighted in red (BEB and/or SLR) or orange (NEB) boxes. (A) Dlx1a. (B) Dlx2a. (C) Dlx3a. (D) Dlx4b.