BBC News - Leg bone gives up oldest human DNA:
"The Denisovans were a sister group to the Neanderthals, with distinct genetic characteristics. Identified only by DNA extracted from a tiny finger bone and tooth, they are, as some researchers have remarked, "a genome in search of a fossil" because there are no substantial remains representative of this group.
By using missing mutations in the old DNA sequences, the researchers calculated that the Pit of Bones individual shared a common ancestor with the Denisovans about 700,000 years ago."
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