3GP8:
reference: Mechanistic basis of 5'-3' translocation in SF1B helicases., Saikrishnan K, Powell B, Cook NJ, Webb MR, Wigley DB, Cell. 2009 May 29;137(5):849-59. PMID: 19490894

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