| 1I9X: reference: Crystal structure of a model branchpoint-U2 snRNA duplex containing bulged adenosines., Berglund JA, Rosbash M, Schultz SC, RNA 2001 May;7(5):682-91. PMID: 11350032 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).