6FCZ:
reference: Structures of C1-IgG1 provide insights into how danger pattern recognition activates complement., Ugurlar D, Howes SC, de Kreuk BJ, Koning RI, de Jong RN, Beurskens FJ, Schuurman J, Koster AJ, Sharp TH, Parren PWHI, Gros P, Science. 2018 Feb 16;359(6377):794-797. doi: 10.1126/science.aao4988. PMID: 29449492

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