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>Interbreeding between Neanderthals and early modern humans is thought to have happened in Eurasia, where Neanderthals once thrived, after the ancestors of modern Eurasians split from the ancestors of modern Africans 50,000–80,000 years ago. Because the ancestors of modern African people didn’t breed with Neanderthals directly, scientists built models for identifying Neanderthal DNA that assumed African individuals have no Neanderthal ancestry. In fact, they’d use modern African genomes as a “null” to eliminate variants as not being Neanderthal in origin.

Actually you were kind of right.

Also:

>The African genomes even contained some stretches of Neanderthal DNA that weren’t found in Eurasian genomes, and Neanderthal sequences that were found in much higher frequencies. The new method also revealed variants that differed in frequency between European and Asian populations. “There’s going to be a lot of interesting work that digs into” those sequences that vary between modern populations, says Capra.