6WHI:
reference: AcrIF9 tethers non-sequence specific dsDNA to the CRISPR RNA-guided surveillance complex., Hirschi M, Lu WT, Santiago-Frangos A, Wilkinson R, Golden SM, Davidson AR, Lander GC, Wiedenheft B, Nat Commun. 2020 Jun 1;11(1):2730. doi: 10.1038/s41467-020-16512-1. PMID: 32483187

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