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In page Lactase persistence:

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The C*14010 allele is today most common among pastoralist groups inhabiting eastern Africa, from where it is thought to have spread along with pastoralism into parts of southern Africa.[1][3][4] [7] Ultimately, the C*14010 lactase persistence variant is believed to have arrived from the Sahara in areas that were previously inhabited by Afroasiatic-speaking populations. This was deduced from the existence of animal husbandry- and milking-related loanwords of Afroasiatic origin in various Nilo-Saharan and Niger-Congo languages, as well as from the earliest appearance of processed milk lipids on ceramics which were found at the Tadrart Acacus archaeological site in Libya (radiocarbon-dated to c. 7,500 BP, close to the estimated age of the C*14010 mutation).[8]