4GMK:
reference: Structure of ribose 5-phosphate isomerase from the probiotic bacterium Lactobacillus salivarius UCC118., Lobley CM, Aller P, Douangamath A, Reddivari Y, Bumann M, Bird LE, Nettleship JE, Brandao-Neto J, Owens RJ, O'Toole PW, Walsh MA, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Dec 1;68(Pt 12):1427-33., doi: 10.1107/S174430911204273X. Epub 2012 Nov 14. PMID: 23192019

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