3BO3: A Relaxed Active Site Following Exon Ligation By A Group I I
reference: A relaxed active site after exon ligation by the group I intron., Lipchock SV, Strobel SA, Proc Natl Acad Sci U S A. 2008 Apr 15;105(15):5699-704. Epub 2008 Apr 11. PMID: 18408159

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