- The secret about human evolution found in spit - the protein in our spit called MUC7 is encoded by a gene with a haplogroup that entered human populations through interbreeding with an archaic "ghost species" hominin population that predated Neanderthal or Denisovan prior to 150,000 years ago. https://www.theguardian.com/global/2017/sep/05/the-secret-about-human-evolution-found-in-spit 16 comments science
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