6QDV:
reference: A human postcatalytic spliceosome structure reveals essential roles of metazoan factors for exon ligation., Fica SM, Oubridge C, Wilkinson ME, Newman AJ, Nagai K, Science. 2019 Feb 15;363(6428):710-714. doi: 10.1126/science.aaw5569. Epub 2019, Jan 31. PMID: 30705154

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