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Growth rates of isogenic strains carrying the indicated rpoB alleles in LB medium (white bars) or LB medium plus Rif (hatched bars). Data are expressed as average doubling times in minutes ± standard deviations (n = 3). Data that were not significantly different (P > 0.01 by ANOVA) were placed into the same group (groups are indicated by lowercase letters). w.t., wild type.
