1AJ8:
reference: The crystal structure of citrate synthase from the hyperthermophilic archaeon pyrococcus furiosus at 1.9 A resolution,., Russell RJ, Ferguson JM, Hough DW, Danson MJ, Taylor GL, Biochemistry 1997 Aug 19;36(33):9983-94. PMID: 9254593

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