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. 2012 Mar 6;7(3):e32826. doi: 10.1371/journal.pone.0032826

Figure 5. Principal components analysis of base frequencies among mitochondrial genome sequences.

Figure 5

A Plot of the first principal component against the second principal component (explaining 93% and 5% of the variability, respectively). B Boxplot of PC1 according to insect orders. An ANOVA of the first principal component shows that the base composition in Hymenoptera is significantly biased relative to the other orders (P<0.01 for all pairwise comparisons involving Hymenoptera), due to very high AT frequencies. Samples are color-coded based on order-level taxonomic affiliations (see Fig. 2).