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Transcriptional activity of the trHb gene promoters in M. tuberculosis H37Ra under nitrosative and oxidative stress: (A) glbN and (B) glbO promoter activities at different growth phases of M. tuberculosis H37Ra in the presence of 10 and 30 mM sodium nitrite and (C) glbN and (D) glbO promoter activities at different growth phases of M. tuberculosis H37Ra in the presence of 1 and 5 mM H2O2. Statistical significance was established using a P value of <0.05.
