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Publisher's Note: Reference number insertion

Posted by pbio on 08 Oct 2012 at 14:41 GMT

,
http://plosbiology.org/article/info:doi/10.1371/journal.pbio.1001376#article1.body1.sec1.p4

Some reference numbers were omitted from the text. The correct references are: [25,26,28-33].

No competing interests declared.