A new, improved sequencing of ancient human relative genomes reveals that Homo sapiens didn't only have sex with Neanderthals and a little-understood line of humans called Denisovans. A fourth, mystery lineage of humans was in the mix, too.
As reported by the news arm of the journal Nature, new genetic evidence suggests that several hominids — human relatives closer than humans' current living cousin, the chimpanzee — interbred more than 30,000 years ago. This group of kissing cousins included an unknown human ancestor not yet revealed by the ancient DNA record.
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