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. 2012 Jan 6;7(1):e29345. doi: 10.1371/journal.pone.0029345

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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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The evolutionary relationship of the prairie vole to other rodents and rabbit is illustrated as a phylogenetic tree. Divergence times are represented by the branch lengths of the tree based on [39], [40]. The numbers above the terminal branch leading to the prairie vole represent the number of conservative/radical amino acid substitutions in the behaviorally-relevant proteins that were inferred by parsimony to have occurred in that lineage and unique to the prairie vole. MYA refers to millions of years ago.