5ZWO:
reference: Structures of the fully assembled Saccharomyces cerevisiae spliceosome before activation., Bai R, Wan R, Yan C, Lei J, Shi Y, Science. 2018 Jun 29;360(6396):1423-1429. doi: 10.1126/science.aau0325. Epub 2018, May 24. PMID: 29794219

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