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Comparison of CRISPR-Cas systems in S. putrefaciens strains. Schematic diagrams show the single CRISPR-Cas systems from S. putrefaciens W3–18–1 (Sputw3181_2191- Sputw3181_2185, Type I-F) and S. putrefaciens CN-32 (Sputcn32_1819 – Sputcn32_1824, Type I-F variant). The N-terminal 94 amino acids of the Cas3 proteins share 100% aa identity. The C-terminal Cas3 portion and the Cascade components do not reveal significant protein similarity.
