4R5C:
reference: Control of repeat-protein curvature by computational protein design., Park K, Shen BW, Parmeggiani F, Huang PS, Stoddard BL, Baker D, Nat Struct Mol Biol. 2015 Jan 12. doi: 10.1038/nsmb.2938. PMID: 25580576

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