1JGT:
reference: Structure of beta-lactam synthetase reveals how to synthesize antibiotics instead of asparagine., Miller MT, Bachmann BO, Townsend CA, Rosenzweig AC, Nat Struct Biol 2001 Aug;8(8):684-9. PMID: 11473258

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