4UM3:
reference: AChBP Engineered to Mimic the alpha4-beta4 Binding Pocket in alpha4beta2 Nicotinic Acetylcholine Receptors Reveals Interface Specific Interactions Important for Binding and Activity., Shahsavar A, Ahring PK, Olsen JA, Krintel C, Kastrup JS, Balle T, Gajhede M, Mol Pharmacol. 2015 Jul 15. pii: mol.115.098061. PMID: 26180047

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