Fig. 7.

Tolerance of Mtb cells to metal cations. Mycobacterial cells were grown in Sauton media supplemented with varying concentrations of CaCl₂, KCl, and NaCl. OD₆₀₀ of cultures supplemented without cations were considered as 100% of cell growth. Values represent the IC₅₀. Data are mean ± SEM from three independent experiments. Unpaired two-tailed t test, *P < 0.05, **P < 0.01.