2AKQ:
reference: Structure of bovine beta-lactoglobulin (variant A) at very low ionic strength., Adams JJ, Anderson BF, Norris GE, Creamer LK, Jameson GB, J Struct Biol. 2006 Jun;154(3):246-54. Epub 2006 Feb 6. PMID: 16540345

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