6I3B:
reference: Influence of circular permutations on the structure and stability of a six-fold circular symmetric designer protein., Mylemans B, Noguchi H, Deridder E, Lescrinier E, Tame JRH, Voet ARD, Protein Sci. 2020 Oct 2. doi: 10.1002/pro.3961. PMID: 33006397

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