3HJH:
reference: An N-terminal clamp restrains the motor domains of the bacterial transcription-repair coupling factor Mfd., Murphy MN, Gong P, Ralto K, Manelyte L, Savery NJ, Theis K, Nucleic Acids Res. 2009 Oct;37(18):6042-53. Epub 2009 Aug 21. PMID: 19700770

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