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Expression level (in Miller units) of the adcR mutant containing transcriptional lacZ-fusions to PadcR, PadcAII, PphtA, PphtB, and PphtE grown in CDM with or without addition of 0.5 mM Ni2+. Standard deviation of three independent replications is indicated with error bars. Statistical significance of the differences in the expression levels was determined by One-way ANOVA (NS, not significant).
