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The DNA used in the study is some of the oldest ever to be sequenced. Meyer, a molecular geneticist at the Max Planck Institute of Evolutionary Biology, and colleagues, including paleogeneticist Svante Paabo, are experts at this kind of genetic sleuthing, part of the group that released a draft Neanderthal genome in 2010, as well as a Denisovan genome in 2012. But working with DNA this ancient was a new challenge. The Neanderthal and Denisovan fossils used for sequencing are all less than 100,000 years old. The DNA from the Pit of Bones is four times as ancient???and that’s a problem.