1ITF:
reference: The three-dimensional high resolution structure of human interferon alpha-2a determined by heteronuclear NMR spectroscopy in solution., Klaus W, Gsell B, Labhardt AM, Wipf B, Senn H, J Mol Biol 1997 Dec 12;274(4):661-75. PMID: 9417943

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