1X6U:
reference: Crystal Structures of Escherichia coli KDO8P Synthase Complexes Reveal the Source of Catalytic Irreversibility., Vainer R, Belakhov V, Rabkin E, Baasov T, Adir N, J Mol Biol 2005 Aug 19;351(3):641-52. PMID: 16023668

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