4UC1:
reference: Protein structure. Crystal structures of translocator protein (TSPO) and mutant mimic of a human polymorphism., Li F, Liu J, Zheng Y, Garavito RM, Ferguson-Miller S, Science. 2015 Jan 30;347(6221):555-8. doi: 10.1126/science.1260590. PMID: 25635101

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