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. 2013 Jul 3;8(7):e67568. doi: 10.1371/journal.pone.0067568

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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.

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GenBank accession numbers of reference ctyB sequences are provided. Topology and divergence dates were inferred using a relaxed molecular clock and a Yule tree prior using BEAST v1.6.2. X axis is in millions of years. Posterior probabilities >0.8 are provided at nodes.