3EOH:
reference: Structural basis for exon recognition by a group II intron., Toor N, Rajashankar K, Keating KS, Pyle AM, Nat Struct Mol Biol. 2008 Nov;15(11):1221-2. Epub 2008 Oct 26. PMID: 18953333

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