| 1NT9: reference: Architecture of initiation-competent 12-subunit RNA polymerase II., Armache KJ, Kettenberger H, Cramer P, Proc Natl Acad Sci U S A 2003 Jun 10;100(12):6964-8. PMID: 12746495 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).