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virB operon transcriptional induction. (A) Expression of the virB10::lacZ fusions of B. abortus 2308 virB10::lacZ-Gm (●) and B. abortus 2308 virB1::Kan virB10::lacZ-Gm (○). β-Galactosidase activity was expressed as A420/volume × A600. (B) Growth curve of B. abortus 2308 virB10::lacZ-Gm and B. abortus 2308 virB1::Kan virB10::lacZ-Gm strains. Symbols are the same as in panel A. OD600, optical density at 600 nm.
