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. 2009 Jan 21;4(1):e4232. doi: 10.1371/journal.pone.0004232

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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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The different rings represent (from outer to inner) all genes and insertion elements, which are color coded by functional group (rings 1 and 2), deviation from average G+C content (ring 3), and GC skew ((G−C)/(G+C); ring 4). Colors represent the following: red, virulence associated; green, mobile elements; blue, plasmid transfer; yellow, plasmid replication; orange, unknown; pink, plasmid maintenance; black, hypothetical proteins; and gray, other functions.