3H09:
reference: Active-site gating regulates substrate selectivity in a chymotrypsin-like serine protease the structure of haemophilus influenzae immunoglobulin A1 protease., Johnson TA, Qiu J, Plaut AG, Holyoak T, J Mol Biol. 2009 Jun 12;389(3):559-74. Epub 2009 Apr 23. PMID: 19393662

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