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Integration site of f237 phage on KX-V237 chromosome. The location of the integration site of f237 on clone 5-7-H is schematically presented. ◢, 12-bp direct repeats; black box, dif-like sequence; blocks, ORFs of the f237 genome. The numbers in the blocks are ORF numbers (10). Arrows (A, B, and C) show the positions and directions of primers for PCR.
