2QPL:
reference: Crystal structure of calf spleen purine nucleoside phosphorylase complexed to a novel purine analogue., Pereira HM, Berdini V, Cleasby A, Garratt RC, FEBS Lett. 2007 Oct 30;581(26):5082-6. Epub 2007 Oct 2. PMID: 17927987

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