2WBN:
reference: Structural basis for the nuclease activity of a bacteriophage large terminase., Smits C, Chechik M, Kovalevskiy OV, Shevtsov MB, Foster AW, Alonso JC, Antson AA, EMBO Rep. 2009 May 15. PMID: 19444313

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