• Reuters

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Scientists examining the genomes of West Africans have detected signs that a mysterious extinct human species interbred with our own species tens of thousands of years ago in Africa, the latest evidence of humankind’s complicated genetic ancestry.

The study indicated that present-day West Africans can trace a substantial proportion, about 2 to 19 percent, of their genetic ancestry to an extinct human species — what the researchers called a “ghost population.”

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