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. 2011 Apr 29;6(4):e18768. doi: 10.1371/journal.pone.0018768

Figure 2. Significant 16S eigenpositions.

Figure 2

Line-joined graphs of the second through seventh 16S eigenpositions, i.e., patterns of nucleotide frequency across the organisms, and their correlation with the taxonomic groups in the 16S alignment, classified according to the top six hierarchical levels of the NCBI Taxonomy Browser [19] (Figure S1 in Appendix S1). (a) The second most significant eigenposition (red) differentiates the Eukarya excluding the Microsporidia from the Bacteria, as indicated by the color bar (Table 1). The fourth (blue) distinguishes between the Gamma Proteobacteria and the Actinobacteria and Archaea. (b) The third (red) and fifth (blue) eigenpositions describe similarities and dissimilarities among the Archaea and Microsporidia, respectively. (c) The sixth (red) and seventh (blue) eigenpositions differentiate the Fungi/Metazoa excluding the Microsporidia from the Rhodophyta and the Alveolata, respectively.