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β-Galactosidase activity in M. tuberculosis containing narGHJI and narK2X promoter constructs. β-Galactosidase assays were performed with cell extracts from aerobic actively growing (open bars) or NRP-1 (filled bars) cultures. Each strain had lacZ controlled by the upstream region of narG (PMP101) or narK2X (PMP102) or no insert (PMP100). The means ± standard deviations (error bars) of three determinations are shown.
