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Effects of hns mutant alleles on gene expression. All strains containing either proU-lacZ (THK62) (A) fimB-lacZ (AL90) (B) fusions and the indicated hns plasmids were grown to mid-log phase at 30°C and assayed for β-galactosidase activity (27). Data represent the averages of three to four independent experiments in duplicate. Error bars, standard errors of the means.
