2RHF:
reference: Structure and function of the regulatory C-terminal HRDC domain from Deinococcus radiodurans RecQ., Killoran MP, Keck JL, Nucleic Acids Res. 2008 May;36(9):3139-49. Epub 2008 Apr 13. PMID: 18411208

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