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CRISPR type I-E/ECOLI-associated protein CasB/Cse2 CRISPR is a term for Clustered, Regularly Interspaced Short Palidromic Repeats. A number of protein families appear only in association with these repeats and are designated Cas (CRISPR-Associated) proteins. This model family is found in Ecoli subtype CRISPR/Cas regions of many bacteria, most of which are mesophiles, and not in Archaea. It was designated Cse2 originally, and renamed CasB based on its characterization in the CASCADE complex.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",