2FL9:
reference: Evolution of Bacteriophage Tails: Structure of T4 Gene Product 10., Leiman PG, Shneider MM, Mesyanzhinov VV, Rossmann MG, J Mol Biol. 2006 Mar 9;. PMID: 16554069

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