4U4C:
reference: The Molecular Architecture of the TRAMP Complex Reveals the Organization and Interplay of Its Two Catalytic Activities., Falk S, Weir JR, Hentschel J, Reichelt P, Bonneau F, Conti E, Mol Cell. 2014 Sep 18;55(6):856-67. doi: 10.1016/j.molcel.2014.07.020. Epub 2014 , Aug 28. PMID: 25175027

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