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. 2016 Feb 22;11(2):e0146216. doi: 10.1371/journal.pone.0146216

Fig 3. Minimum spanning tree of 28 B. anthracis strains belonging to the A.Br.001/002 polytomy.

Fig 3

The tree is based upon 1669 chromosomal SNPs. The diameter of each circle varies according to the number of isolates sharing the same genotype. The length of each branch is proportional (logarithmic scale) to the indicated number of SNPs. Branches with no indication of length value have a length of one SNP. The red star indicates the position of the root, as defined by using the Australia_94 strain genome as an outgroup. The red arrow indicates the approximate position of the timing of the introduction of the Ames lineage to the USA according to [14].