3PLW:
reference: Creating directed double strand breaks with the Ref protein: a novel RecA-dependent nuclease from bacteriophage P1., Gruenig MC, Lu D, Won SJ, Dulberger CL, Manlick AJ, Keck JL, Cox MM, J Biol Chem. 2011 Jan 3. PMID: 21193392

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