5G5L:
reference: RNA polymerase I-Rrn3 complex at 4.8 A resolution., Engel C, Plitzko J, Cramer P, Nat Commun. 2016 Jul 15;7:12129. doi: 10.1038/ncomms12129. PMID: 27418309

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