Not all predicted CRISPR–Cas systems are equal: isolated cas genes and classes of CRISPR like elements

Abstract excerpt

BACKGROUND: The CRISPR-Cas systems in prokaryotes are RNA-guided immune systems that target and deactivate foreign nucleic acids. A typical CRISPR-Cas system consists of a CRISPR array of repeat and spacer units, and a locus of cas genes. The CRISPR and the cas locus are often located next to each other in the genomes. However, there is no quantitative estimate of the co-location. In addition, ad-hoc studies have...

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