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The agents tested included the siderophores desferricoprogen (EMC Microcollections, Germany), pyoverdines-Fe-complex (Sigma-Aldrich, UK) and ferrichrome-Fe-free (Santa Cruz, USA); siderophore-like molecules 2,3-dihydroxybenzoic acid (Acros Organics, Belgium) and salicylic acid (ChemCruz Biochemicals, USA); and the iron chelator ferric citrate (Sigma-Aldrich, UK).
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