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Model of MotA/AsiA activation at a T4 middle promoter. The cartoon depicts the positions of σ70, AsiA, and MotA at a T4 middle promoter. MotACTD interacts with the MotA box motif (5′ [T/A][T/A]TGCTT[T/C]A 3′) centered at −30. Both AsiA and MotANTD interact with the C-terminal region of σ70. The positions of σ70 regions 2.4 and 4.2 are shown. (See text for details.)
