| 2O5I: reference: Structural basis for transcription elongation by bacterial RNA polymerase., Vassylyev DG, Vassylyeva MN, Perederina A, Tahirov TH, Artsimovitch I, Nature. 2007 Jun 20;. PMID: 17581590 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).