1T72:
reference: Crystal structure of the "PhoU-like" phosphate uptake regulator from Aquifex aeolicus., Oganesyan V, Oganesyan N, Adams PD, Jancarik J, Yokota HA, Kim R, Kim SH, J Bacteriol. 2005 Jun;187(12):4238-44. PMID: 15937186

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