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CRISPR-associated protein 1 (cas1) is one of the two universally conserved proteins found in the CRISPR prokaryotic immune defense system. Cas1 is a metal-dependent DNA-specific endonuclease that produces double-stranded DNA fragments. Cas1 forms a stable complex with the other universally conserved CRISPR-associated protein, cas2, which is essential to spacer acquisition for CRISPR systems.
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