| 4W92: reference: Crystal structure of a c-di-AMP riboswitch reveals an internally pseudo-dimeric RNA., Jones CP, Ferre-D'Amare AR, EMBO J. 2014 Sep 30. pii: e201489209. PMID: 25271255 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).