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CRISPR-associated protein Cas4, subtype PREFRAN Members of this family are the Cas4 protein of a novel CRISPR subtype, PREFRAN, found in Prevotella bryantii B14, Prevotella disiens FB035-09AN, Francisella tularensis subsp. novicida, Francisella philomiragia, Butyrivibrio proteoclasticus B316, Helcococcus kunzii ATCC 51366, etc.
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