4E1I:
reference: Crystal structure of a human prion protein fragment reveals a motif for oligomer formation., Apostol MI, Perry K, Surewicz WK, J Am Chem Soc. 2013 Jul 17;135(28):10202-5. doi: 10.1021/ja403001q. Epub 2013 Jul, 2. PMID: 23808589

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