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Publisher's Note: Errors in author contributions

Posted by PLOS_CompBiol on 21 May 2013 at 16:05 GMT

There were errors in the Author Contributions. The correct contributions are: Conceived and designed the experiments: WH, JK, SJ, and FA. Performed the experiments: WH. Analyzed the data: WH JK. Contributed reagents/materials/analysis tools: WH JK SJ. Wrote the paper: WH, JK and FA.

No competing interests declared.