3CRX:
reference: Structure of the Holliday junction intermediate in Cre-loxP site-specific recombination., Gopaul DN, Guo F, Van Duyne GD, EMBO J 1998 Jul 15;17(14):4175-87. PMID: 9670032

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