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Expression of lapF::lacZ is reduced in an lapA mutant. Plasmid pMMGA or pMMG1 was introduced in KT2440 (white bars), mus-20 (lapF mutant; gray bars), and mus-42 (lapA mutant; black bars), and β-galactosidase activity was measured after overnight growth in LB medium. Results are averages and standard deviations from three experiments with duplicate samples. The asterisk indicates statistically significant differences relative to the wild type (wt) (Student's t test, P ≤ 0.05).
