1D9G:
reference: The 2.0 A structure of bovine interferon-gamma; assessment of the structural differences between species., Randal M, Kossiakoff AA, Acta Crystallogr D Biol Crystallogr 2000 Jan;56 ( Pt 1):14-24. PMID: 10666622

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