1E1J:
reference: NMR structures of three single-residue variants of the human prion protein., Calzolai L, Lysek DA, Guntert P, von Schroetter C, Riek R, Zahn R, Wuthrich K, Proc Natl Acad Sci U S A 2000 Jul 18;97(15):8340-5. PMID: 10900000

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