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The arms race between bacteria and phages has led to the development of exquisite bacterial defense systems including a number of uncharacterized systems distinct from the well-known Restriction-Modification and CRISPR/Cas systems. Here, we report functional analyses of the GajA protein from the newly predicted Gabija system. The GajA protein is revealed as an endonuclease unique in that: 1. It may function as a restriction enzyme or a site-specific nicking enzyme, depending on the arrangementdoi:10.1101/2020.12.18.423425 fatcat:qyl7o74opza3tdwb52szmmespy