| 4DS6: reference: Crystal structure of a group II intron in the pre-catalytic state., Chan RT, Robart AR, Rajashankar KR, Pyle AM, Toor N, Nat Struct Mol Biol. 2012 Apr 8. doi: 10.1038/nsmb.2270. PMID: 22484319 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).