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Assessment of efflux activity on the M. tuberculosis strains in study. Ethidium bromide was used at the equilibrium concentration for each strain as follows: 0.25 μg/ml for H37Rv, MtbPT1, MtbPT5, MtbPT7, and MtbPT11; 0.5 μg/ml, MtbPT3; and 1 μg/ml, MtbBR1; verapamil was tested at half MIC.
