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. 2011 Feb 4;6(2):e16806. doi: 10.1371/journal.pone.0016806

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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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(A) A case of spontaneous preterm birth showing destruction of the chorionic trophoblast layer by infiltrating lymphocytes. (B) In another case of spontaneous preterm birth, lymphocytic infiltration extended to the chorioamniotic connective tissue layer. Original magnification X200.