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Communicated by Frans B. M. de Waal, Emory University, Atlanta, GA, October 30, 2008 (received for review July 21, 2008)
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- Published in issue January 6, 2009.
- Published first December 8, 2008.
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© 2008 by The National Academy of Sciences of the USA
Author Information
- aDepartment of Neurobiology and Cognition Research, University of Vienna, A-1091 Wien, Austria;
- cKonrad Lorenz Institute for Evolution and Cognition Research, A-3422 Altenberg, Austria; and
- bWolf Science Center, 4645 Grünau, Austria
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Communicated by Frans B. M. de Waal, Emory University, Atlanta, GA, October 30, 2008 (received for review July 21, 2008)
Footnotes
- 1To whom correspondence should be addressed at: Department of Neurobiology and Cognition Research, University of Vienna, Althanstrasse 14, A-1090 Wien, Austria. E-mail: ufriederike.range{at}univie.ac.at
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Author contributions: F.R., Z.V., and L. Huber designed research; F.R. and L. Horn performed research; F.R. analyzed data; and F.R. wrote the paper.
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The authors declare no conflict of interest.
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This article contains supporting information online at www.pnas.org/cgi/content/full/0810957105/DCSupplemental.
- © 2008 by The National Academy of Sciences of the USA
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