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Expression by the rpoS–lacZ operon fusion monitored by β-galactosidase activity (Miller units). KT1008SL cells harbored either plasmids with the PPX1 gene (pTrcPPX1) or the control vector (pTrcHisB). (A) Induction of rpoS transcription was monitored after starvation in an M9 minimal medium (25). (B) Expression of rpoS-lacZ fusion was tested during growth in LB.
