| 4S20: reference: Structural basis for transcription reactivation by RapA., Liu B, Zuo Y, Steitz TA, Proc Natl Acad Sci U S A. 2015 Feb 2. pii: 201417152. PMID: 25646438 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).