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Regulation of feoA and feoB by iron. The steady-state transcript levels of feoA and feoB in the wild type strain grown in modified GSY medium with either no added iron, 10 μm FeCl3, 20 μm FeCl3, or 100 μm FeCl3 were analyzed by qualitative real time PCR. The data are expressed as relative starting quantities (SQ) of respective mRNAs normalized to the housekeeping gene gapA and are presented as averages of three replicates ± S.D. (error bars).
