2J0Q:
reference: The crystal structure of the exon junction complex reveals how it maintains a stable grip on mRNA., Bono F, Ebert J, Lorentzen E, Conti E, Cell. 2006 Aug 25;126(4):713-25. PMID: 16923391

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