Proportion of TFs in organisms depending on their lifestyles.

<p>Organisms were classified in either of four categories: intracellular, pathogens, extremophiles, and free-living, in agreement with [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195332#pone.0195332.ref018" target="_blank">18</a>]. TF proportions were calculated as the ratio between the total number of TFs and the genome size (in ORFs). The line shown inside the box is the median value. The whisker caps represent the minimum and maximum values. Points outside the bars represent the outlier genomes.