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Additional Acknowledgement

Posted by pukkila on 30 Sep 2010 at 17:35 GMT

We are grateful to Shehre-Banoo Malik for providing comments on the manuscript.
http://plosgenetics.org/article/info:doi/10.1371/journal.pgen.1001135#article1.back1.ack1.p2

The University of North Carolina at Chapel Hill’s Libraries provided support for open access publication.

No competing interests declared.