5JBL:
reference: Common Evolutionary Origin of Procapsid Proteases, Phage Tail Tubes, and Tubes of Bacterial Type VI Secretion Systems., Fokine A, Rossmann MG, Structure. 2016 Nov 1;24(11):1928-1935. doi: 10.1016/j.str.2016.08.013. Epub 2016, Sep 22. PMID: 27667692

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