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Siderophore levels in spent culture supernatants of RN6390 and Newman and their respective fur derivatives, H295 and H706. Bacteria were grown in an iron-deficient (open bars) or an iron-replete (iron-deficient medium supplemented with 50 μM iron chloride) (gray bars) medium, while the fur::Km derivatives of both RN6390 and Newman (solid bars) were grown in an iron-replete medium. Siderophore units were calculated as described in Materials and Methods. O.D., optical density.
