5WSG:
reference: Structure of a yeast step II catalytically activated spliceosome., Yan C, Wan R, Bai R, Huang G, Shi Y, Science. 2017 Jan 13;355(6321):149-155. doi: 10.1126/science.aak9979. Epub 2016, Dec 15. PMID: 27980089

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