A Comprehensive Curation Shows the Dynamic Evolutionary Patterns of Prokaryotic CRISPRs

Figure 4

CRISPR distribution dynamics in the prokaryotic genomes. (a) Histogram of the standard deviation (StdEv) values of the 107 genera, each of which has at least three genomes in the CRISPR annotations. (b) The 16S rRNA phylogenetic tree of the 8 completely sequenced Thermoanaerobacter genomes, rooted at a closely related species Thermobifida fusca YX. The two numbers in the brackets are the numbers of annotated CRISPRs and CRISPRs with transposon insertions, respectively.

(a)

(b)