| 5Y6A: reference: Crystal structure of an anti-CRISPR protein, AcrIIA1., Ka D, An SY, Suh JY, Bae E, Nucleic Acids Res. 2017 Nov 22. pii: 4647678. doi: 10.1093/nar/gkx1181. PMID: 29182776 |
This OCA 
Structure page
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(documentation).