| 1SGZ: 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).