HPK Content versus Genome Size

<p>The percent of each genome is plotted as a function of genome size. As reported in previous studies, there is a roughly linear correlation. Highlighted in colored symbols are several groups of genomes described in the text: genomes coding a high (≥1.5%) fraction of HPKs—red squares; the model organisms, E. coli and <i>B. subtilis—</i>green circles; genomes with a high number of HGT events<i>—</i>blue triangles; Bradyrhizobium japonicum (high number of both HGT and LSE genes)<i>—</i>pink diamond; and Streptomyces coelicolor (high percentage of LSE genes)<i>—</i> turquoise diamond.