5GQH:
reference: A CRISPR evolutionary arms race: structural insights into viral anti-CRISPR/Cas responses., Wang J, Ma J, Cheng Z, Meng X, You L, Wang M, Zhang X, Wang Y, Cell Res. 2016 Sep 2;26(10):1165-1168. doi: 10.1038/cr.2016.103. Epub 2016 Sep 2. PMID: 27585537

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