Fascinating! Excerpts ->
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.
Muddle in the middle
So there are several possibilities as to how Denisovan-like DNA could turn up in Middle Pleistocene Spain. Firstly, the mitochondrial DNA type from the pit came from a population ancestral to both the Spanish hominids and to Denisovans.
Secondly, interbreeding between the Pit of Bones people (or their ancestors) and yet another early human species brought the Denisovan-like DNA into this western population. Prof Bermudez de Castro thinks there may be a candidate: an earlier human species known as Homo antecessor. One million years ago, antecessor inhabited the site of Gran Dolina, just a few hundred metres away from the Pit of Bones.
Prof Chris Stringer, from London's Natural History Museum, told BBC News: "We need all the data we can get to build the whole story of human evolution.
(Still waiting for that "missing link" though aren't we?)
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