6QJH:
reference: Heparin-induced tau filaments are polymorphic and differ from those in Alzheimer's and Pick's diseases., Zhang W, Falcon B, Murzin AG, Fan J, Crowther RA, Goedert M, Scheres SH, Elife. 2019 Feb 5;8. pii: 43584. doi: 10.7554/eLife.43584. PMID: 30720432

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