3P9A:
reference: Small Terminase Couples Viral DNA Binding to Genome-Packaging ATPase Activity., Roy A, Bhardwaj A, Datta P, Lander GC, Cingolani G, Structure. 2012 Jul 3. PMID: 22771211

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