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These proteins have few functions, but one of the functions is it protects the tissues from pathogens. Previous research has shown that the humans carry their own variants of the WUC19 gene with a unique series of mutations which pass on to some humans. That kind of mixture, that mixture was common in the ancient world. Most humans in life today carry some Neanderthal DNA, whereas Denisovan DNA makes up as much as 5% of the genomes of people.