4ZDT:
reference: Crystal structure and SUMO binding of Slx1-Slx4 complex., Lian FM, Xie S, Qian C, Sci Rep. 2016 Jan 20;6:19331. doi: 10.1038/srep19331. PMID: 26787556

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