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Publisher's Note: Omission of Acknowledgements

Posted by PLOS_ONE_Group on 09 May 2013 at 23:42 GMT

The Acknowledgements section was omitted from the article.

The Acknowledgements section is: We thank John Taylor for useful comments in a previous version of this paper. We thank Sandrine Lacoste for helping in molecular experiments. We also thank an anonymous referee for the prize of the best tree ever (not shown).

No competing interests declared.