Population structure of <i>S. pombe</i>.

<p>Neighbor-joining tree (a) and the results of principal component analysis (PCA) (b) and the program STRUCTURE (c). The numbers of the strains correspond to those in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0104241#pone-0104241-t001" target="_blank">Table 1</a>. The 5 samples that strongly cluster together are colored in blue. The results of STRUCTURE with <i>K = 4</i> changes when different subsets of randomly chosen SNPs are used, and the result of <i>K = 4</i> shown here represents one example. The grouping of strains 15, 16, 17, 18, and 30, and the grouping of strains 2, 9, 32, and 1 are both always observed. The results of <i>K = 2</i> and <i>K = 3</i> are consistent.</p>