1USL:
reference: Mycobacterium tuberculosis ribose-5-phosphate isomerase has a known fold, but a novel active site., Roos AK, Andersson CE, Bergfors T, Jacobsson M, Karlen A, Unge T, Jones TA, Mowbray SL, J Mol Biol 2004 Jan 16;335(3):799-809. PMID: 14687575

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