FIG. 2.

Growth analysis of strains grown in the presence of absence of mgtB. Cultures of MM1490 (mgtC⁺ mgtB⁺) (•) and MM1665 (mgtC⁺ mgtB) (■) were grown overnight in N minimal medium supplemented with 10 mM or 70 μM Mg²⁺. Cultures were processed as described in the legend to Fig. 1 and grown at various Mg²⁺ concentrations at 37°C. Aliquots were removed at the indicated times, and the OD₆₀₀ was measured. Growth similar to that seen at 70 μM Mg²⁺ was seen at other Mg²⁺ concentrations below 500 μM.