5ZO5:
reference: NrnC, an RNase D-Like Protein From Agrobacterium, Is a Novel Octameric Nuclease That Specifically Degrades dsDNA but Leaves dsRNA Intact., Yuan Z, Gao F, Yin K, Gu L, Front Microbiol. 2019 Jan 7;9:3230. doi: 10.3389/fmicb.2018.03230. eCollection, 2018. PMID: 30666241

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