1BXD:
reference: NMR structure of the histidine kinase domain of the E. coli osmosensor EnvZ., Tanaka T, Saha SK, Tomomori C, Ishima R, Liu D, Tong KI, Park H, Dutta R, Qin L, Swindells MB, Yamazaki T, Ono AM, Kainosho M, Inouye M, Ikura M, Nature 1998 Nov 5;396(6706):88-92. PMID: 9817206

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