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VciB confers increased ferric iron reductase activity independently of Feo. Strains with (EPV153) or without (EPV156) feo carrying either empty vector or pVCvciB were assessed for the capacity to reduce iron over time using a whole-cell iron reductase assay. The A562 is proportional to the amount of Fe2+-FerroZine species. The data are means and standard deviations from three biological replicates.
