2ETN:
reference: Crystal structure of Thermus aquaticus Gfh1, a Gre-factor paralog that inhibits rather than stimulates transcript cleavage., Lamour V, Hogan BP, Erie DA, Darst SA, J Mol Biol. 2006 Feb 10;356(1):179-88. Epub 2005 Nov 17. PMID: 16337964

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