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CRISPR-Cas gene clusters in streptococcal genomes. The five classes (designated 1 to 5) of CRISPR-Cas gene clusters identified in the genomes of this study are shown; representative genomes containing these clusters are indicated on the left. The annotation given by the RAST server (http://rast.nmpdr.org/) was used. Red, Cas1 genes; blue, Cas2 genes; S. sp, Streptococcus sp.
