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. 2010 Sep 7;8(9):e1000475. doi: 10.1371/journal.pbio.1000475

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Error bars indicate 95% standard error of the mean d_N/d_S ratios. Significance tests were performed using Wilcoxon rank sum test since the d_N/d_S ratios did not follow normal assumptions (Table S9).