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