Document Type

Article

Publication Date

2008

Comments

This article was originally published in the journal PLoS Biology. Copyright © 2008 Michael J. Beran. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Creative Commons License

Creative Commons Attribution 3.0 License
This work is licensed under a Creative Commons Attribution 3.0 License.

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