3H2T:
reference: The structure of gene product 6 of bacteriophage T4, the hinge-pin of the baseplate., Aksyuk AA, Leiman PG, Shneider MM, Mesyanzhinov VV, Rossmann MG, Structure. 2009 Jun 10;17(6):800-8. PMID: 19523898

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