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. 2008 Feb 8;4(2):e23. doi: 10.1371/journal.pgen.0040023

Figure 7. Positive Association of Selective Signatures (ν) and Fixation Index, Independent of dN/dS.

Figure 7

We counted E. coli genes with FI > 1.2 or FI < 0.6 as “high” and “low,” and with log2 ν > 0.5 (ν > 1.4) or log2 ν < −0.5 (ν < 0.7) as “high” and “low.” The genes were divided into sets with relatively high dN/dS ( >0.06), medium (0.02 < dN/dS < 0.06), or low dN/dS (<0.02). Within each set, counts were binned in 2 × 2 contingency tables to calculate the Odds Ratio statistic, with Odds Ratio > 1 indicating positive association between ν and FI. One-sided p-values of Fisher's exact test are shown.