3VEM:
reference: Structural Basis of Transcriptional Gene Silencing Mediated by Arabidopsis MOM1., Nishimura T, Molinard G, Petty TJ, Broger L, Gabus C, Halazonetis TD, Thore S, Paszkowski J, PLoS Genet. 2012 Feb;8(2):e1002484. Epub 2012 Feb 9. PMID: 22346760

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