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Physical map of the transcriptional units activated by FhlA. Coding regions are represented by block arrows, −12/−24 promoters are indicated by black right-angled arrows, the FNR-dependent promoter PhypB is indicated by brown right-angled arrows, and the UAS where FhlA binds (8, 33, 51) are shown by a red-hatched arrow and red boxes. The fragments present in the lacZ reporter fusions used for the transcriptional studies are indicated in black (the lacZ gene is not drawn to scale).
