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Publisher's Note: Correction to Acknowledgments

Posted by PLOS_CompBiol on 03 Sep 2008 at 16:53 GMT

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http://ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1000152#article1.body1.sec4.sec2.p1

The following sentence was missing from the Acknowledgments: The authors are grateful to Charles Nicholson for very helpful discussions.