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. 2009 Jun 8;4(6):e5836. doi: 10.1371/journal.pone.0005836

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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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Haplogroup U individuals are labeled in red and Haplogroup H individuals are labeled in yellow. The graph shows the fraction of the time period cohort that survived (y axis) to a given age (x axis).