| 1VFN: reference: Crystal structure of calf spleen purine nucleoside phosphorylase in a complex with hypoxanthine at 2.15 A resolution., Koellner G, Luic M, Shugar D, Saenger W, Bzowska A, J Mol Biol 1997 Jan 17;265(2):202-16. PMID: 9020983 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).