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Ferrous iron uptake of the strains grown in LIM (--) and LIM + 15 μM Fe(III) (Fe). Uptake was measured with 1 μM Fe, which represents the high-affinity system. All strains were assayed after 24 h of growth in defined medium, and values represent triplicate determinations (mean ± standard deviation). The experiment was repeated three times with identical relative uptake rates.
