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. 2014 Apr 16;15:288. doi: 10.1186/1471-2164-15-288

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Copyright © 2014 Girault 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 credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Minimum spanning tree of 67 French B. anthracis strains belonging to the B.Br.CNEVA canSNP lineage. Data are based on 345 chromosomal SNPs (A), 14 pXO1 SNPs (B) and 15 pXO2 SNPs (C). The geographic clustering of the French strains is color-coded: Alps in green (34 strains), Pyrenees in purple (9 strains), Massif Central in red (18 strains) and Saône et Loire department in yellow (6 strains). The diameter of each circle varies according to the number of isolates having the same genotype. The length of each branch is proportional (logarithmic scale) to the number of SNPs identified between strains. Indicated in red are the position and name of four French canSNPs described in this study. Based on a parsimony approach, the tree size is 352, i.e. it contains approximately 1.98% of homoplasia. Concerning the plasmids, the tree sizes are 14 and 15 for pXO1 and pXO2, respectively, i.e. it contains no homoplasia.