6I84:
reference: Structure of transcribing RNA polymerase II-nucleosome complex., Farnung L, Vos SM, Cramer P, Nat Commun. 2018 Dec 21;9(1):5432. doi: 10.1038/s41467-018-07870-y. PMID: 30575770

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