Fig. 2.—

Median and interquartile range of corrected HF (ΔHF_shuff = HF_obs − HF_exp) for hexamers as a function of genome GC%, in the highest affinity hexamer bin. The horizontal solid black line indicates no difference in observed and expected HF. Red triangles indicate organisms that do not use the SD mechanism. Colored circles and triangles indicate genomes for which HF_obs is significantly different from HF_exp. Spearman’s rho and P-value is given for the relationship between ΔHF_shuff and genome GC%, for colored circles below 0.