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Effects of the iron chelator Con on the growth of the S. meliloti wild-type strain and the S. meliloti sitA mutant strain. Strains Rm1021 (▪) and Rm1021ΔsitA (▴) were grown in TY medium containing 240 mg of Con/liter (A), 240 mg of Con/liter and 25 μM Fe(II) (B), or 240 mg of Con/liter and 25 μM Mn(II) (C). The depicted results were obtained from five independent replicates, and the error bars indicate the standard deviations. o.d.580, optical density at 580 nm.
