6GX5:
reference: Structures of filaments from Pick's disease reveal a novel tau protein fold., Falcon B, Zhang W, Murzin AG, Murshudov G, Garringer HJ, Vidal R, Crowther RA, Ghetti B, Scheres SHW, Goedert M, Nature. 2018 Sep;561(7721):137-140. doi: 10.1038/s41586-018-0454-y. Epub 2018 Aug, 29. PMID: 30158706

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