Figure 4.

Frequencies of ECHs along the X chromosome

Proportion of non-African haplotypes called ECHs in each 100 kb window across the X chromosome (blue). In fourteen cases, more than 50% of individual haplotypes are called ECHs. Vertical blue bands in the bottom part each show the core regions around each peak where the proportion of non-Africans’ called ECHs is at least 90% of its peak value. ECHs in the Ust’-Ishim male, called using the clique finding approach, are shown in red (an additional track below shows the center 500 kb regions of each ECH that share an UPGMA clade with the Ust’-Ishim). Regions depleted of incomplete lineage sorting between humans, chimpanzees, and gorillas are shown in orange.