Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and thought to have lived across Asia. Now, traces of them have turned up in an unexpected place—Spain. In a technical feat, researchers sequenced the oldest human DNA yet, retrieving an almost complete mitochondrial genome from a 300,000- to 400,000-year-old sliver of human bone found in Spain's Atapuerca Mountains. To their surprise, this proto-Neandertal yielded ancestral Denisovan DNA.
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