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And there's a body of research that's growing that's shown that xenophobic inter-bradinal Neanderthals in humans shaping the biology of people living nowadays. And to look at the connections, researchers examined the genomes of humans from across the globe in particular. The team, they were looking at a gene called MUC19, which plays an important role in the immune system. The group found that humans with indigenous American ancestry were more likely than other populations to carry a variant of this gene that came from Denisovan. This ancient genetic heritage may have helped humans survive new ecosystems in North and South America.