2GJZ:
reference: Bifunctional catalysis of proton transfer at an antibody active site., Muller R, Debler EW, Steinmann M, Seebeck FP, Wilson IA, Hilvert D, J Am Chem Soc. 2007 Jan 24;129(3):460-1. PMID: 17226987

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