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We have studied the recombination of plasmids bearing bom and cer sites. The bom (basis of mobilization) site is required for conjugative transfer, while the cer (ColE1 resolution) site is involved in the resolution of plasmid multimers, which increases plasmid stability. We constructed a pair of parent plasmids in such a way as to allow us select clones containing recombinant plasmids directly. Clone...