Fig. 7From: Evolution of the avian β-defensin and cathelicidin genesNatural selection in avian β-defensins, cathelicidins, and three primate genes (DEFB1, DEFB4 and CAMP). a Proportion of codon sites under positive and negative selection in each gene; b Comparison between mean rates of synonymous and nonsynonymous substitutions (dN − dS) in the signal and propiece region and mature peptide domainBack to article page