7BWN:
reference: Cellular Synthesis and Crystal Structure of a Designed Protein Heterocatenane., Liu Y, Duan Z, Fang J, Zhang F, Xiao J, Zhang W, Angew Chem Int Ed Engl. 2020 Jun 7. doi: 10.1002/anie.202005490. PMID: 32506656

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