1TQG:
reference: Helical shifts generate two distinct conformers in the atomic resolution structure of the CheA phosphotransferase domain from Thermotoga maritima., Quezada CM, Gradinaru C, Simon MI, Bilwes AM, Crane BR, J Mol Biol 2004 Aug 27;341(5):1283-94. PMID: 15321722

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