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Schematic representation of M. catarrhalis gene products involved in the truncated denitrification pathway and construction of relevant mutants. Schematic diagram of the M. catarrhalis chromosomal locus containing the norB, nsrR, and aniA genes and flanking regions in the wild-type O35E strain (A), the O35E norB mutant (B), the O35E aniA norB mutant (C), and the O35E nsrR norB mutant (D). The relative positions of the different primers used for PCR are indicated by the arrows.
