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Genealogical representation of coalescent times for D- and non-D-haplogroup alleles of the microcephalin gene (two different groups of closely related haplotypes at this locus; Evans et al. 2006). The extremely recent coalescence time for the D-haplogroup alleles, and their ancient divergence from the non-D-haplogroup alleles, supports the hypothesis of introgression of the D-alleles from an archaic Homo lineage into H. sapiens ca 37 000 yr BP (Evans et al. 2006).
