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Intracellular redox potential of M. bovis BCG P55 strains. Cell cultures in quadruplicate wells were treated with drugs for 1 h before the addition of MTT. The reduced formazan product was measured at 600 nm after an additional 3 h of incubation. The dimethyl sulfoxide solvent had no effect compared to no treatment (data not shown). The results shown represent data from one of three independent experiments. Abs600, absorbance at 600 nm.
