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Topology of the ER promoter. The relative positions of the transcription initiation sites P1 and P0, as well as the documented regulatory elements are illustrated. The regulatory sites are indicated as follows: (a) ER-EH0 [18], (b) a negative regulatory element [17], (c) ERBF-1 [16], (d) ERUBF-1 [15], and (e) ERF-1 [13]
