3Q77:
reference: Unexpected Active-Site Flexibility in the Structure of Human Neutrophil Elastase in Complex with a New Dihydropyrimidone Inhibitor., Hansen G, Gielen-Haertwig H, Reinemer P, Schomburg D, Harrenga A, Niefind K, J Mol Biol. 2011 Apr 27. PMID: 21549129

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