Taxonomic distribution of putative prokaryotic metacaspases in sequenced genomes.

<p>The mean metacaspase abundance (metacaspases per 1000 proteins) is shown in the upper bars (light blue), for each group (i.e. phylum, except for Proteobacteria, which have been divided into classes, unclassified Bacteria, which encompasses <i>Candidatus</i> Cloacamonas acidaminovorans and <i>Thermobaculum terrenum</i> ATCC BAA-798, and unclassified Proteobacteria, harboring the single member <i>Magnetococcus</i> sp. MC-1). The lower bars show the total number of sequenced genomes within each group. These are divided into categories based on the range of their metacaspase abundance (metacaspases per 1000 proteins). The prokaryotic groups have been ordered on mean metacaspase abundance, with the highest on top. The “Other” categories comprise groups that are represented by five or less sequenced genomes and lack putative metacaspases. Scaling is the same for both the bacterial and archaeal charts.