3X1L:
reference: Crystal Structure of the CRISPR-Cas RNA Silencing Cmr Complex Bound to a Target Analog., Osawa T, Inanaga H, Sato C, Numata T, Mol Cell. 2015 May 7;58(3):418-30. doi: 10.1016/j.molcel.2015.03.018. Epub 2015, Apr 23. PMID: 25921071

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).