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U.S.A."],"published-print":{"date-parts":[[2015,3,10]]},"abstract":"<jats:title>Significance<\/jats:title>\n                  <jats:p>Bacteria have evolved clustered regularly interspaced short palindromic repeats (CRISPRs) together with CRISPR-associated (Cas) proteins to defend themselves against viral infection. RNAs derived from the CRISPR locus assemble with Cas proteins into programmable DNA-targeting complexes that destroy DNA molecules complementary to the guide RNA. In type II CRISPR-Cas systems, the Cas9 protein binds and cleaves target DNA sequences at sites complementary to a 20-nt guide RNA sequence. This activity has been harnessed for a wide range of genome-engineering applications. 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