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. 2009 May 26;7(5):e1000112. doi: 10.1371/journal.pbio.1000112

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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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Evolutionary time is estimated using d _S (the number of synonymous substitutions per synonymous site) and a divergence time of 91 million years. The greater number of genes in the mouse compared with the human genome is largely accounted for by the lower rate of olfactory and vomeronasal receptor gene duplications (red) in the primate lineage.