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Effect of different Mg2+ concentrations on growth of ponA cells. Cells were grown at 37°C in PAB medium with addition of MgCl2 at various concentrations. The symbols for the strains and MgCl2 concentrations added are as follows: □, PS832 (wild type), no additions; ○, PS2062 (ponA), no additions; •, PS2062 (ponA), 50 μM Mg2+; ◊, PS2062 (ponA), 100 μM Mg2+; ▵, PS2062 (ponA), 1 mM Mg2+; and ■, PS2062 (ponA), 10 mM Mg2+.
