5LMX:
reference: The dynamic assembly of distinct RNA polymerase I complexes modulates rDNA transcription., Torreira E, Louro JA, Pazos I, Gonzalez-Polo N, Gil-Carton D, Duran AG, Tosi S, Gallego O, Calvo O, Fernandez-Tornero C, Elife. 2017 Mar 6;6. pii: e20832. doi: 10.7554/eLife.20832. PMID: 28262097

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