3QQC:
reference: Architecture of the RNA polymerase-Spt4/5 complex and basis of universal transcription processivity., Martinez-Rucobo FW, Sainsbury S, Cheung AC, Cramer P, EMBO J. 2011 Mar 8. PMID: 21386817

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