2J80:
reference: A ligand-induced switch in the periplasmic domain of sensor histidine kinase CitA., Sevvana M, Vijayan V, Zweckstetter M, Reinelt S, Madden DR, Herbst-Irmer R, Sheldrick GM, Bott M, Griesinger C, Becker S, J Mol Biol. 2008 Mar 21;377(2):512-23. Epub 2008 Jan 16. PMID: 18258261

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