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. 2010 Sep 29;5(9):e12900. doi: 10.1371/journal.pone.0012900

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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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Evidence suggests that this disease, characterized by external epithelial tumor masses (white arrows), is caused by a herpesvirus. Photo: Lacey Price/Marine Photobank, taken April 2008.