2XDH:
reference: Noncellulosomal cohesin from the hyperthermophilic archaeon Archaeoglobus fulgidus., Voronov-Goldman M, Lamed R, Noach I, Borovok I, Kwiat M, Rosenheck S, Shimon LJ, Bayer EA, Frolow F, Proteins. 2010 Aug 24. PMID: 20954171

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