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Expression of hrpG (A) and prhG (B) in different genetic backgrounds after 16 h of growth in minimal medium supplemented with glutamate at a 20 mM final concentration. β-Galactosidase activity is expressed as a percentage of the level of expression measured in the wild-type (WT) genetic background. Each measurement corresponds to the average of four replicates, and bars indicate standard deviations.
