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Model of the disposition of σ70 regions 2, 3, and 4, Q82, and Qλ in open and paused complexes of phage late gene promoters. Rectangular boxes span regions of reactivity by FeBABE conjugates to σ70 residues of the enclosed number, or to Q82. Ovals and spheres designate positions of protein regions. Region 4 of σ70 in the presence of Q cannot be presumed to bind DNA and is shown displaced. (A) λ; (B) phage 82.
