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Mg2+ requirement of cpoA mutations. Strains were grown in C-medium pH 6, and culture density was monitored by nephelometry [NU]. The medium contained either 0.195 mg/ml MgCl2 final concentration (filled circles) or 0.39 mg/ml MgCl2 (squares). A: R6; B: P104; C: P106; D: R6ΔcpoA.
