4YB7:
reference: Campylobacter jejuni adenosine triphosphate phosphoribosyltransferase is an active hexamer that is allosterically controlled by the twisting of a regulatory tail., Mittelstadt G, Moggre GJ, Panjikar S, Nazmi AR, Parker EJ, Protein Sci. 2016 Aug;25(8):1492-506. doi: 10.1002/pro.2948. Epub 2016 Jun 6. PMID: 27191057

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