2FBK:
reference: The Crystal Structure of the Transcriptional Regulator HucR from Deinococcus radiodurans Reveals a Repressor Preconfigured for DNA Binding., Bordelon T, Wilkinson SP, Grove A, Newcomer ME, J Mol Biol. 2006 Jun 30;360(1):168-77. Epub 2006 May 19. PMID: 16750221

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