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ß-Galactosidase activities of the fiu-lacZ fusion strain H1780 harboring the indicated plasmids and grown in LB under iron-limiting (200 μM 2,2-dipyridyl) (black bars) and iron-sufficient (100 μM FeCl3) (gray bars) conditions. The assays were performed in triplicate, and values are expressed as the means, with standard deviations displayed as error bars.
