A Protein Reveals the Oldest Episode of Sex and Procreation Among Human Species

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Since humans developed the ability to study DNA extracted from fossils, we discovered a mystery that until now had no answer. In the DNA of some human species, including ours, Homo sapiens, there were “superarchaic” markings, vestiges of older and unknown species with which we had sex and children. Faced with the inability to determine who those genomic intruders were, some scientists called them ghost populations.