In a new study published this week in the journal Nature, an international team of researchers analyzed DNA from more than 700 sediment samples that were collected from the Pleistocene layers of Denisova Cave in Siberia and detected ancient hominin and mammalian mitochondrial DNA (mtDNA) in 685 and 175 samples, respectively; the earliest evidence for hominin mtDNA is of Denisovans, and is associated with the stone tools that were deposited approximately...
