| 1RGA: reference: Crystal structure of RNase T1 with 3'-guanylic acid and guanosine., Zegers I, Haikal AF, Palmer R, Wyns L, J Biol Chem 1994 Jan 7;269(1):127-33. PMID: 8276784 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).