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Influence of RpoS on pyocyanin production. Growth was measured as OD600 (▴) and pyocyanin levels (■) are expressed as a function of time in P. aeruginosa PAO1 (A), the rpoS mutant strain PAO-MW20 (B), and PAO-MW20 with the ptac-rpoS plasmid pMW105 (C). For the latter (C), isopropyl-β-d-thiogalactopyranoside (IPTG) was added at a final concentration of 100 μM.
