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CRISPR-associated endonuclease Cas1, subtype I-B/HMARI/TNEAP The CRISPR-associated protein Cas1 is virtually universal to CRISPR systems. CRISPR, an acronym for Clustered Regularly Interspaced Short Palindromic Repeats, is prokaryotic immunity system for foreign DNA, mostly from phage. CRISPR systems belong to different subtypes, distinguished by both nature of the repeats, the makeup of the cohort of associated Cas proteins, and by molecular phylogeny within the more universal Cas proteins such as this one. This model is of type EXCEPTION and provides more specific information than the EQUIVALOG model TIGR00287. It describes Cas1 subgroup that includes Cas1 proteins of the related HMARI and TNEAP subtypes of CRISPR/Cas system.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",