1BDJ:
reference: Structure of the histidine-containing phosphotransfer (HPt) domain of the anaerobic sensor protein ArcB complexed with the chemotaxis response regulator CheY., Kato M, Shimizu T, Mizuno T, Hakoshima T, Acta Crystallogr D Biol Crystallogr. 1999 Jul;55(Pt 7):1257-63. PMID: 10393292

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