1WLS:
reference: Structure of the type I L-asparaginase from the hyperthermophilic archaeon Pyrococcus horikoshii at 2.16 A resolution., Yao M, Yasutake Y, Morita H, Tanaka I, Acta Crystallogr D Biol Crystallogr 2005 Mar 1;61(Pt 3):294-301. Epub 2005, Feb 24. PMID: 15735339

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