3CZ4:
reference: Structural insights into the catalytic mechanism of the bacterial class B phosphatase AphA belonging to the DDDD superfamily of phosphohydrolases., Leone R, Cappelletti E, Benvenuti M, Lentini G, Thaller MC, Mangani S, J Mol Biol. 2008 Dec 12;384(2):478-88. Epub 2008 Sep 27. PMID: 18845157

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