Distribution of DupB genotype frequencies for chimpanzee subspecies.

<p>X-axis shows individuals homozygous for the deletion (DupB−/−), heterozygous for the deletion (DupB+/−) or homozygous for the presence of RS3 (DupB+/+). Different chimpanzee subspecies are indicated on the map in black (1) (<i>Pan troglodytes verus</i>), dark grey (2) (<i>Pan troglodytes troglodytes</i>) and white (3) (<i>Pan troglodytes schweinfurthii</i>). Hybrids are not shown on the map. (Map adapted from Prüfer et al 2012) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0113364#pone.0113364-Prufer1" target="_blank">[96]</a>.