1CU4:
reference: Antibody binding defines a structure for an epitope that participates in the PrPC-->PrPSc conformational change., Kanyo ZF, Pan KM, Williamson RA, Burton DR, Prusiner SB, Fletterick RJ, Cohen FE, J Mol Biol 1999 Nov 5;293(4):855-63. PMID: 10543972

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