Protein reveals the oldest episode of sex and procreation among human species
Since humans developed the ability to study DNA extracted from fossils, we have uncovered a mystery that until now had no answer. In the DNA of some human species, including our own, Homo sapiens, there were “super-archaic” markers, vestiges of older, unknown species with which we had interbred and produced offspring. Unable to determine who these genomic intruders were, some scientists called them ghost populations.
