3BQP:
reference: Structures of the human ceramide activator protein saposin D., Popovic K, Prive GG, Acta Crystallogr D Biol Crystallogr. 2008 May;64(Pt 5):589-94. Epub 2008, Apr 19. PMID: 18453694

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