1CBN:
reference: Atomic resolution (0.83 A) crystal structure of the hydrophobic protein crambin at 130 K., Teeter MM, Roe SM, Heo NH, J Mol Biol. 1993 Mar 5;230(1):292-311. PMID: 8450543

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