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The intergenic rssA-sprE region contains an RpoS-dependent promoter for sprE. The β-galactosidase levels of an ‘rssA-sprE’-lacZ+ fusion were measured in a wild-type strain (NR511) and an rpoS::kan strain (NR512) during logarithmic (hatched bars) and stationary (black bars) phases of growth in LB medium. The relative levels of β-galactosidase activity are shown as the average and SD of three measurements per sample, and they are representative of at least three independent experiments.
