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Were there Neanderthals in Africa?

“Neanderthal” admixture seems to be higher in West Africans than in East Africans. How come? (Source) When modern humans began their expansion from a small core somewhere in East Africa, the continent probably had several different archaic populations.It now seems that one of them was related to the Neanderthals in Europe. In an ongoing study of Neanderthal admixture in present-day humans, John Hawks has found an apparently higher level of admixture in the Yoruba of Nigeria than in the Luhya of Kenya (see chart above).
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