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. 2011 Nov 2;6(11):e26877. doi: 10.1371/journal.pone.0026877

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This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.

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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Antepartum LPS serum samples were collected at day 15 of pregnancy, intrapartum LPS samples at days 16 and 17, antepartum term samples at days 17, 18 and 19 and intrapartum term at days 20 and 21. Note that progesterone levels drop dramatically near parturition time (days 20 and 21) in control mice at term while LPS-treated mice that delivered preterm did not show changes in progesterone levels. * Different from antepartum, P<0.05. 3 to 5 samples were analyzed at each time point.