2MKC:
reference: Cooperative structure of the heterotrimeric pre-mRNA retention and splicing complex., Wysoczanski P, Schneider C, Xiang S, Munari F, Trowitzsch S, Wahl MC, Luhrmann R, Becker S, Zweckstetter M, Nat Struct Mol Biol. 2014 Sep 14. doi: 10.1038/nsmb.2889. PMID: 25218446

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