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. 2013 Jan 7;8(1):e53341. doi: 10.1371/journal.pone.0053341

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© 2013 Li et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Phylogenetic tree analysis of 50 strains. White bars: gene absence, black bars: gene presence, red bars: no information. (B) Characteristics of 50 strains. Cluster analysis indicated that all of the 50 strains were clustered into seven different complexes.