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Regulation of narK and narR promoter activities. Expression of the promoters for narK and narR was assessed in P. pantotrophus wild type and P. pantotrophus narR::Ω bearing plasmids pMPnarKpro (A) and pMPnarRpro (B). Activity is expressed in Miller units for the cultures grown under aerobic conditions (grey bars) and cultures grown under denitrifying conditions with nitrite as the electron acceptor (black bars).
