"Scientists compared the Neanderthal genome with the genomes of five present-day humans from different parts of the world: France, China, Papua New Guinea and southern and western Africa.
The findings suggest that modern humans, after migrating from Africa 45,000 to 80,000 years ago, bred with Neanderthals then in the Middle East before spreading into Eurasia.
The authors estimated that 1 to 4 percent of the modern human genome of non-Africans can be traced back to the Neanderthal."
UPDATE:> Some question the study's conclusions.
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