3ZN5:
reference: Bacteriophage p23-77 capsid protein structures reveal the archetype of an ancient branch from a major virus lineage., Rissanen I, Grimes JM, Pawlowski A, Mantynen S, Harlos K, Bamford JK, Stuart DI, Structure. 2013 May 7;21(5):718-26. doi: 10.1016/j.str.2013.02.026. Epub 2013 Apr, 25. PMID: 23623731

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