3IGI:
reference: Tertiary architecture of the Oceanobacillus iheyensis group II intron., Toor N, Keating KS, Fedorova O, Rajashankar K, Wang J, Pyle AM, RNA. 2010 Jan;16(1):57-69. Epub 2009 Dec 1. PMID: 19952115

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