| 4DOZ: reference: Crystal structure of Cmr2 suggests a nucleotide cyclase-related enzyme in type III CRISPR-Cas systems., Zhu X, Ye K, FEBS Lett. 2012 Mar 23;586(6):939-45. doi: 10.1016/j.febslet.2012.02.036. Epub, 2012 Feb 28. PMID: 22449983 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).