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flag Ancient interbreeding likely involved female humans and male Neanderthals, per DNA study.

flag Based on a lack of Neanderthal DNA on the human X chromosome, a recent study published in Science concludes that ancient interbreeding between modern humans and Neanderthals probably involved more female humans mating with male Neanderthals. flag Although the precise causes are still unknown, researchers claim that this pattern points to asymmetric mating, which may be caused by biological or social factors. flag The results, which are based on ancient DNA analysis, corroborate previous findings that modern humans' immunity and risk of disease are influenced by Neanderthal genes.

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