3J0K:
reference: Molecular architecture of the human Mediator-RNA polymerase II-TFIIF assembly., Bernecky C, Grob P, Ebmeier CC, Nogales E, Taatjes DJ, PLoS Biol. 2011 Mar;9(3):e1000603. Epub 2011 Mar 29. PMID: 21468301

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