3MOS:
reference: The crystal structure of human transketolase and new insights into its mode of action., Mitschke L, Parthier C, Schroder-Tittmann K, Coy J, Ludtke S, Tittmann K, J Biol Chem. 2010 Oct 8;285(41):31559-70. Epub 2010 Jul 28. PMID: 20667822

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