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. 2011 Jan 31;6(1):e14640. doi: 10.1371/journal.pone.0014640

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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 and B. SEM analysis showing microvilli (arrow). Scale bars, 200 µm (A) and 10 µm (B). C and D. Ultrathin sections (TEM). Presence of intracellular tight junctions (arrow). Scale bar, 0.5 µm. E. Number of cellular junctions in the core and rim areas.