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Fluorescence of FyuA-GFP in Y. enterocolitica WA-CS (- -) and WA-CS irp1::Kanr (—) in NB medium (A), NBD medium (B), NBD medium plus purified yersiniabactin (C), and NBD medium plus desferrioxamine B (D). (E) Positive (WA-CS[pGFP mut 3]; -- --) and negative (WA-CS; -- —— --) controls. Au, arbitrary units.
