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batB is not transcribed in B. pertussis. β-Galactosidase activity from the batB promoter from B. bronchiseptica (Bb promoter), B. pertussis (Bp promoter), and the B. parapertussishu promoter (Bpp promoter) in B. bronchiseptica strain RB50 (black bars), B. pertussis strain BPSM (white bars), and B. parapertussishu strain 12822 (gray bars) grown under Bvg+-phase conditions.
