4GZY:
reference: Structural basis of transcriptional pausing in bacteria., Weixlbaumer A, Leon K, Landick R, Darst SA, Cell. 2013 Jan 31;152(3):431-41. doi: 10.1016/j.cell.2012.12.020. PMID: 23374340

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).