2KX8:
reference: Preformed protein-binding motifs in 7SK snRNA: structural and thermodynamic comparisons with retroviral TAR., Durney MA, D'Souza VM, J Mol Biol. 2010 Dec 10;404(4):555-67. Epub 2010 Sep 15. PMID: 20816986

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