1SGZ: Crystal Structure Of Unbound Beta-Secretase Catalytic Domain.
reference: Flap position of free memapsin 2 (beta-secretase), a model for flap opening in aspartic protease catalysis., Hong L, Tang J, Biochemistry 2004 Apr 27;43(16):4689-95. PMID: 15096037

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