2BD5:
reference: Structural analyses on intermediates in serine protease catalysis., Liu B, Schofield CJ, Wilmouth RC, J Biol Chem. 2006 Aug 18;281(33):24024-35. Epub 2006 Jun 5. PMID: 16754679

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