There is genetic evidence of significant back migration from the Middle East to Africa, accounting for 30%-40% of modern sub-Saharan African ancestry in most populations and 20% in African hunter-gathers, at a quite great time depth. The data isn't completely consistent however.
Razib Khan mentioned a couple of the relevant papers in a quick post and another relevant paper is mentioned in the comments.
I put off blogging about it in order to write a longer post discussing the previous genetic analysis of uniparental genetics, the historical context, the methodological issues, the linguistic questions this poses, and the archaeology.
But the best was becoming the enemy of the good, so I am making this quick post in order to not let these papers fall off the my radar screen entirely without mention.
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