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Vertical competition between psk+ and psk− plasmids contained in RR1. Cells containing either psk−p or psk+p were coincubated at 37°C in LBH broth with shaking as described in Materials and Methods. Relative success of the two plasmid types is expressed as the ratio of psk+p-containing cells to psk−p-containing cells. Values reported are the average (and SD) of three independent experiments.
