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. 2008 Mar 12;3(3):e1781. doi: 10.1371/journal.pone.0001781

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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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Amino acid residues are represented as the group M consensus. Degrees of conservation are color-coded as shown at the bottom. Conserved motifs (variability below 1%) are boxed.