CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) is a widespread family of prokaryotic direct repeats with spacers of unique sequence between consecutive repeats. This protein family, typified by YPO2465 of Yersinia pestis, is a CRISPR-associated (Cas) family strictly associated with the Ypest subtype of CRISPR/Cas locus. This family is designated Csy1, for CRISPR/Cas Subtype Ypest protein 1.
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