4GNY:
reference: Ligand binding and self-association cooperativity of beta-lactoglobulin., Gutierrez-Magdaleno G, Bello M, Portillo-Tellez MC, Rodriguez-Romero A, Garcia-Hernandez E, J Mol Recognit. 2013 Feb;26(2):67-75. doi: 10.1002/jmr.2249. PMID: 23334914

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