6EXP:
reference: Anti-CRISPR proteins encoded by archaeal lytic viruses inhibit subtype I-D immunity., He F, Bhoobalan-Chitty Y, Van LB, Kjeldsen AL, Dedola M, Makarova KS, Koonin EV, Brodersen DE, Peng X, Nat Microbiol. 2018 Apr;3(4):461-469. doi: 10.1038/s41564-018-0120-z. Epub 2018, Mar 5. PMID: 29507349

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