3LBN:
reference: Allosteric modulation of Ras positions Q61 for a direct role in catalysis., Buhrman G, Holzapfel G, Fetics S, Mattos C, Proc Natl Acad Sci U S A. 2010 Mar 16;107(11):4931-6. Epub 2010 Mar 1. PMID: 20194776

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