Comparison of the lengths of proteins encoded in complete CPR and non-CPR genomes. (A) Comparison of the lengths of proteins from CPR and non-CPR (free-living species) bacteria. (B) Comparison of the lengths of proteins from CPR and non-CPR (symbiotic species) bacteria. Distributions of lengths of proteins are shown as density curves using the deduced amino acid sequences of the protein genes for 69 CPR bacteria (red line) and 140 representative non-CPR bacteria (70 free-living lineages and 70 symbiotic lineages; each black line). (C) CPR bacteria have smaller genomes with shorter proteins. We used 897 CPR bacterial genomes (69 complete and 828 draft genomes; red dots), 167 symbiotic non-CPR bacterial genomes (blue dots), and 1494 free-living non-CPR bacterial genomes (black dots) in the analysis. The lower panel is an enlarged view of part of the upper panel.
