Fig. 1From: Mechanism of transcription-coupled DNA modification recognitionStructure of RNA polymerase II elongation complex. The incoming NTP enters the pol II active site through the secondary channel of pol II (dashed circle). The bridge helix (BH) is shown in green, while the RNA, template DNA (TS), and non-template DNA (NTS) are shown in red, blue, and cyan, respectivelyBack to article page