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Representative example of deletion strategy. Rows are prophage genomes with genomic deletions indicated by the delta symbol. Phage protection conferred by each lysogen against an infecting phage is shown on the right with darker colors indicating stronger protection. Iterative deletions of smaller sizes narrow down on the genes necessary for protection. The defense system is colored green with a yellow background. Phage protection assays done in triplicate on 3 separate days.

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