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Effect of relA multicopy on transcription of rpoS in P. aeruginosa. The expression of the rpoS′-lacZ transcriptional fusion in PAO1(pMMB67, pMAL.S) (squares) and PAO1(pMRL4, pMAL.S) (diamonds) grown in LB medium was monitored with β-Gal activity assays as described in Materials and Methods.
