Synonymous sequence divergence for mitochondrial atp1. Shown is the dS tree resulting from a codon-based likelihood analysis of the mitochondrial atp1 gene. Branch lengths are in units of synonymous substitutions per synonymous site. All unique species available in GenBank (546) were included in the analysis. Topological constraints were enforced during the analysis (see methods). Names are shown only for taxa with unusually long or short branches. Figures 1, 2, and 3 are drawn to the same scale.
Mower et al. BMC Evolutionary Biology 2007 7:135 doi:10.1186/1471-2148-7-135