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Culture density of iron-replete SCHU S4 (A) or iron-depleted SCHU S4 (B) at 24 h in CDM supplemented with 2 μg/ml FeSO4 (white bars) or 12 μg/ml FeSO4 (gray bars), together with gentamicin (genta) (0.5 μg/ml) or gallium (100 μM). Similar results were observed in two additional experiments.
