| 2Q21: reference: Crystal structures at 2.2 A resolution of the catalytic domains of normal ras protein and an oncogenic mutant complexed with GDP., Tong LA, de Vos AM, Milburn MV, Kim SH, J Mol Biol 1991 Feb 5;217(3):503-16. PMID: 1899707 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).