An article published in the journal “Proceedings of the National Academy of Sciences” reports the results of the analysis of a tooth belonging to a Denisovan that is part of a mandible discovered on the Tibetan plateau, dating back 160,000 years ago. It’s a three-rooted mandibular molar, a characteristic that today exists in a part of Asian modern humans and only rarely in Caucasian populations. That characteristic was considered the result of a mutation occurred in modern humans after the first migrations out of Africa but this discovery suggests that it’s instead the result of an interbreeding with the Denisovans.