4RHM:
reference: Crystal Structure of an Arginase-like Protein from Trypanosoma brucei That Evolved without a Binuclear Manganese Cluster., Hai Y, Kerkhoven EJ, Barrett MP, Christianson DW, Biochemistry. 2014 Dec 23. PMID: 25536859

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