6NSX:
reference: Cus2 enforces the first ATP-dependent step of splicing by binding to yeast SF3b1 through a UHM-ULM interaction., Talkish J, Igel H, Hunter O, Horner SW, Jeffery NN, Leach JR, Jenkins JL, Kielkopf CL, Ares M Jr, RNA. 2019 May 20. pii: rna.070649.119. doi: 10.1261/rna.070649.119. PMID: 31110137

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