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Sign Of A Mysterious Human Ancestor Has Been Found In Our Spit

It’s not enough for some people on this planet to say they have their mother’s eyes – they can now claim to have their great, great, great… (a few thousand greats later) …great grandmother’s saliva.

A variation on the gene for our spit’s mucus shows signs of having been passed down from a distant ancestor. Not only is this gene unique among modern humans, it looks nothing like the one possessed by our Neanderthal or Denisovan cousins, leaving us to ask; just who did they get it from?