1PY9:
reference: The crystal structure of myelin oligodendrocyte glycoprotein, a key autoantigen in multiple sclerosis., Clements CS, Reid HH, Beddoe T, Tynan FE, Perugini MA, Johns TG, Bernard CC, Rossjohn J, Proc Natl Acad Sci U S A 2003 Sep 16;100(19):11059-64. Epub 2003 Sep 5. PMID: 12960396

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