6UM9:
reference: Ligand- and pH-Induced Structural Transition of Gypsy Moth Lymantria dispar Pheromone-Binding Protein 1 (LdisPBP1)., Terrado M, Okon M, McIntosh LP, Plettner E, Biochemistry. 2020 Sep 22;59(37):3411-3426. doi: 10.1021/acs.biochem.0c00592., Epub 2020 Sep 11. PMID: 32877603

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