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Growth competitions. The ratio of colony-forming units (cfu) obtained for a strain carrying the ftsK allele of interest to the cfu obtained for a strain with the wild-type ftsK allele in (A) an AB1157 background, (B) a Tus− background, and (C) a dif::loxP background with cells expressing Cre recombinase. D. The growth competition coefficients obtained from assays shown in A–C (mean and SD of two experiments).
