5GZS:
reference: Structural studies of the periplasmic portion of the diguanylate cyclase CdgH from Vibrio cholerae., Xu M, Wang YZ, Yang XA, Jiang T, Xie W, Sci Rep. 2017 May 12;7(1):1861. doi: 10.1038/s41598-017-01989-6. PMID: 28500346

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