4MXR:
reference: Formiminoglutamase from trypanosoma cruzi is an arginase-like manganese metalloenzyme., Hai Y, Dugery RJ, Healy D, Christianson DW, Biochemistry. 2013 Dec 23;52(51):9294-309. doi: 10.1021/bi401352h. Epub 2013 Nov , 21. PMID: 24261485

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