2M8C:
reference: The Role of the Two Structural Domains from the Periplasmic E. coli Histidine Binding Protein HisJ., Chu BC, Dewolf T, Vogel HJ, J Biol Chem. 2013 Sep 13. PMID: 24036119

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