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Interestingly, data supports san coming TO africa as easily as FROM africa.
http://dienekes.blogspot.com/2013/06...ration-to.html
And combined with this which shows lots of intermixing with eurasia, it's confirmed they had eurasian admixture before they got to africa (this is from populations with no exposure outside their little tribes until very recently, who remain pure).
http://dienekes.blogspot.com/2013/07...e-san-via.html
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