Multiple and ancient origins of the domestic dog.

@article{Vil1997MultipleAA,
  title={Multiple and ancient origins of the domestic dog.},
  author={Carles Vil{\`a} and Peter Savolainen and Jes{\'u}s E. Maldonado and Isabel R. Amorim and Jessica E. Rice and Rodney L. Honeycutt and Keith A. Crandall and Joakim Lundeberg and Robert K. Wayne},
  journal={Science},
  year={1997},
  volume={276 5319},
  pages={
          1687-9
        }
}
Mitochondrial DNA control region sequences were analyzed from 162 wolves at 27 localities worldwide and from 140 domestic dogs representing 67 breeds. Sequences from both dogs and wolves showed considerable diversity and supported the hypothesis that wolves were the ancestors of dogs. Most dog sequences belonged to a divergent monophyletic clade sharing no sequences with wolves. The sequence divergence within this clade suggested that dogs originated more than 100,000 years before the present… 
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