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Transformation efficiencies of the indicated strains to nalidixic acid resistance (Nalr) by plasmid pSY6. Error bars represent the standard errors of the means of results from at least 4 experiments. *, P < 0.02, relative to values for FA1090 and the Δ1686 1686+ mutant (D1686/1686+), by Student’s two-tailed t test.
