2HNF:
reference: Structure of a Hyper-cleavable Monomeric Fragment of Phage lambda Repressor Containing the Cleavage Site Region., Ndjonka D, Bell CE, J Mol Biol. 2006 Sep 22;362(3):479-89. Epub 2006 Jul 15. PMID: 16934834

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