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Growth curves of H37Ra, H37RaΔsigB, and H37RaΔsigB(pMV261::sigB) in liquid culture at 37°C. The OD600 was measured by using a SynergyH1 Hybrid reader (BioTek, USA) every 48 h. Data represent the means of three biological replicates, and error bars denote the standard deviations.
