Fig. 3. b-Galactosidase activities of various promoter–lacZ reporter genes in early stationary phase (6 h) and late stationary
phase (24 h). Wild-type, 6S RNA null (ssrS1), relA null (DrelA) and double mutant (DrelAssrS1) strain backgrounds containing
chromosomal copies of the promoters indicated were grown to (a) early stationary phase (6 h) or (b) late stationary phase
(24 h) in RDM. The relA promoters are relAP1(”42+1) and relAP2(–41+2). Data shown are mean of at least three independent experiments with three duplicate samples per experiment. Error bars, SD.