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Effect of different Na+ concentrations on the growth of E. coli strain KNabc upon introduction of the gerT gene of B. cereus. The ODs of cultures were measured after 16 h of growth at 37°C. The precise growth conditions are described in Materials and Methods. Symbols: ○, KNabc/pGEM3zf+, a strain containing the plasmid vector only; •, KNabc/pAS1, containing the gerT gene cloned in pGEM3zf+.
