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Activities of the pvdE and pvdS promoters. The P. aeruginosa strains shown were grown in King's B medium, and β-galactosidase was assayed. (A) pvdE promoter activity was assayed with plasmid pMP190∷PpvdE. (B) pvdS promoter activity was assayed with pMP190∷PpvdS. + Pvd, pyoverdine was added to a concentration of 60 μM.
