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. 2010 Mar 31;10:97. doi: 10.1186/1471-2180-10-97

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Copyright ©2010 Chen et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Population history in L. innocua-L. monocytogenes clade inferred by the distribution of the exterior/interior branch length ratio of trees resulting from ClonalFrame analysis as compared to trees simulated under the coalescent model. L. innocua spp. (A) and its group subgroup I (B), and L. monocytogenes spp. (D) and its lineage I (E) show a significantly smaller exterior/interior branch length ratio (p < 0.05) than expected under the coalescent model, while L. innocua subgroup II (C) and L. monocytogenes lineages II (F) and III (G) do not.