1K6D:
reference: Autotracing of Escherichia coli acetate CoA-transferase alpha-subunit structure using 3.4 A MAD and 1.9 A native data., Korolev S, Koroleva O, Petterson K, Gu M, Collart F, Dementieva I, Joachimiak A, Acta Crystallogr D Biol Crystallogr 2002 Dec;58(Pt 12):2116-21. PMID: 12454473

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