1W4C:
reference: Atomic snapshots of an RNA packaging motor reveal conformational changes linking ATP hydrolysis to RNA translocation., Mancini EJ, Kainov DE, Grimes JM, Tuma R, Bamford DH, Stuart DI, Cell. 2004 Sep 17;118(6):743-55. PMID: 15369673

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