FIGURE 5.

rRNAs of CPR bacteria lack terminal stem–loop domain(s) in their RNA secondary structures. RNA regions that are lacking in CPR bacteria are indicated by ellipses in the secondary structures of (A) 16S, (B) 23S, and (C) 5S rRNAs of E. coli. The dashed line indicates a region highly conserved in CPR bacteria. See Supplemental Figure S5 for details. These RNA secondary structures were obtained from the Center for Molecular Biology of RNA (http://rna.ucsc.edu/rnacenter/ribosome_images.html).