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Authoritative: http://dx.doi.org/doi:10.1038/news.2009.1079   (Publisher's PDF... likely be available here.)

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Abstract

Mutations in the FOXP2 gene could help explain why humans can speak but chimps can't.

@article{smith09FOXP2,
  author={Kerri Smith},
  title={Evolution of a single gene linked to language},
  journal={Nature},
  year={2009},
  doi={10.1038/news.2009.1079},
  url={http://www.isrl.uiuc.edu/~amag/langev/paper/smith09FOXP2.html}
}