1TKB:
reference: Specificity of coenzyme binding in thiamin diphosphate-dependent enzymes. Crystal structures of yeast transketolase in complex with analogs of thiamin diphosphate., Konig S, Schellenberger A, Neef H, Schneider G, J Biol Chem 1994 Apr 8;269(14):10879-82. PMID: 8144674

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