5EUL:
reference: Crystal structure of a substrate-engaged SecY protein-translocation channel., Li L, Park E, Ling J, Ingram J, Ploegh H, Rapoport TA, Nature. 2016 Mar 17;531(7594):395-9. doi: 10.1038/nature17163. Epub 2016 Mar 7. PMID: 26950603

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