1A4K:
reference: Immunological origins of binding and catalysis in a Diels-Alderase antibody., Romesberg FE, Spiller B, Schultz PG, Stevens RC, Science 1998 Mar 20;279(5358):1929-33. PMID: 9506942

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