5XGA:
reference: Crystal structure of the EnvZ periplasmic domain with CHAPS., Hwang E, Cheong HK, Kim SY, Kwon O, Blain KY, Choe S, Yeo KJ, Jung YW, Jeon YH, Cheong C, FEBS Lett. 2017 May;591(10):1419-1428. doi: 10.1002/1873-3468.12658. Epub 2017, May 9. PMID: 28423182

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