1GTD:
reference: Crystal structure of MTH169, a crucial component of phosphoribosylformylglycinamidine synthetase., Batra R, Christendat D, Edwards A, Arrowsmith C, Tong L, Proteins. 2002 Nov 1;49(2):285-8. PMID: 12211007

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