5NH8:
reference: Metal-dependence of xylose isomerase from Piromyces sp. E2 explored by activity profiling and protein crystallography., Lee M, Rozeboom HJ, de Waal P, de Jong R, Dudek HM, Janssen DB, Biochemistry. 2017 Oct 18. doi: 10.1021/acs.biochem.7b00777. PMID: 29045784

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