1C1K:
reference: Bacteriophage T4 gene 59 helicase assembly protein binds replication fork DNA. The 1.45 A resolution crystal structure reveals a novel alpha-helical two-domain fold., Mueser TC, Jones CE, Nossal NG, Hyde CC, J Mol Biol 2000 Feb 18;296(2):597-612. PMID: 10669611

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