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In PLoS Biology, volume 4, issue 12: doi:10.1371/journal.pbio.0040382
Because of an editorial error, the author contributions were printed incorrectly. The correct author contributions are printed below.
Author contributions. IB and KS conceived and designed the experiments. IB and FvSP performed the experiments. IB and KS analyzed the data. IB and KS wrote the paper.
