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Reporter activity of mbtB promoter fusions of MTB mbtB, cattle MAP mbtB or sheep MAP mbtB to lacZ driven by cIdeR, sIdeR or MTB IdeR. Under iron-rich conditions, cIdeR, sIdeR and MTB IdeR repressed transcription of mbtB. Open bars, transcription in iron-depleted medium; filled bars, transcription in iron-rich medium. Means of three independent experiments, each performed in triplicate, are shown.
