6FLS:
reference: Cotranslational Folding of a Pentarepeat beta-Helix Protein., Notari L, Martinez-Carranza M, Farias-Rico JA, Stenmark P, von Heijne G, J Mol Biol. 2018 Dec 7;430(24):5196-5206. doi: 10.1016/j.jmb.2018.10.016. Epub, 2018 Oct 27. PMID: 30539762

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