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Crystal structure of AcrIF13.A, the crystal structure of AcrIF13 shown in cartoon model. The N-terminal β-sheet, middle α-helices, and C-terminal β-sheet are shown in cyan, yellow, and green, respectively. Two perpendicular views are shown with secondary structures labeled. B, secondary structural elements of AcrIF13 are shown above the sequences, colored as in A. C, topological diagram of AcrIF13. Acr, anti-CRISPR; Csy, CRISPR-Cas surveillance complex.
