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Provisional model for a YvrI-YvrHa holoenzyme–promoter DNA closed transcription complex. Nonessential B. subtilis polymerase subunits (δ- and ω-subunits) are not included. The model depicts known interactions of YvrHa region 2-like segment (r2) with β′-coiled-coil domain (c-c), YvrHa with the amino terminus of YvrI, and YvrI region 4 (r4) with the β-subunit flap domain (flap). Drawing not to scale.
