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RssA levels are growth phase regulated by RpoS. The β-galactosidase levels of an rssA'-‘lacZ fusion were measured in a wild-type (NR501) and an rpoS::kan (NR502) strain 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.
