1YG9:
reference: Crystal structure of cockroach allergen Bla g 2, an unusual zinc binding aspartic protease with a novel mode of self-inhibition., Gustchina A, Li M, Wunschmann S, Chapman MD, Pomes A, Wlodawer A, J Mol Biol. 2005 Apr 29;348(2):433-44. PMID: 15811379

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