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Science 10 July 2009:
Vol. 325. no. 5937, p. 148
DOI: 10.1126/science.1168457
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Technical Comments

Response to Comment by Poinar et al. on "DNA from Pre-Clovis Human Coprolites in Oregon, North America"

M. Thomas P. Gilbert,1 Dennis L. Jenkins,2 Thomas F. G. Higham,3 Morten Rasmussen,1 Helena Malmström,1 Emma M. Svensson,4 Juan J. Sanchez,5 Linda Scott Cummings,6 Robert M. Yohe, II,7 Michael Hofreiter,8 Anders Götherström,4 Eske Willerslev1,*

The arguments of Poinar et al. neither challenge our conclusions nor would contribute to the verification of our data. We counter their questions about the authenticity of our ancient DNA results and the reliability of the radiocarbon data and stand by the conclusion that our data provide strong evidence of pre-Clovis Native Americans.

1 Centre for Ancient Genetics, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark.
2 Museum of Natural and Cultural History, 1224 University of Oregon, Eugene, OR 97403–1224, USA.
3 Research Laboratory for Archaeology and the History of Art, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, UK.
4 Department of Evolutionary Biology, Uppsala University, Norbyvagten 18D, 74236 Uppsala, Sweden.
5 National Institute of Toxicology and Forensic Science, Canary Islands Delegation, 38320 Tenerife, Spain.
6 Paleo Research Institute, 2675 Youngfield Street, Golden, CO 80401, USA.
7 Department of Sociology and Anthropology, California State University, 9001 Stockdale Highway, Bakersfield, CA 93311, USA.
8 Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.

* To whom correspondence should be addressed. E-mail: ewillerslev{at}bio.ku.dk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)