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The PdhR response accounts for the asymmetrical behaviour of the ndh transcript in transitions. (a) The inferred activity of PdhR during anaerobic–aerobic (diamonds, solid line) and aerobic–anaerobic (squares, dashed line) transitions. High-resolution RT-PCR data for the ndh transcript: (b) wild-type E. coli K-12; (c) pdhR mutant, during aerobic–anaerobic (white bars) and anaerobic–aerobic (black bars) transitions.
