9LDT:
reference: Design and synthesis of new enzymes based on the lactate dehydrogenase framework., Dunn CR, Wilks HM, Halsall DJ, Atkinson T, Clarke AR, Muirhead H, Holbrook JJ, Philos Trans R Soc Lond B Biol Sci 1991 May 29;332(1263):177-84. PMID: 1678537

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