6GFE:
reference: Structure of a Therapeutic Full-Length Anti-NPRA IgG4 Antibody: Dissecting Conformational Diversity., Blech M, Horer S, Kuhn AB, Kube S, Goddeke H, Kiefer H, Zang Y, Alber Y, Kast SM, Westermann M, Tully MD, Schafer LV, Garidel P, Biophys J. 2019 May 7;116(9):1637-1649. doi: 10.1016/j.bpj.2019.03.036. Epub 2019, Apr 5. PMID: 31023536

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