1XZW:
reference: Phosphate forms an unusual tripodal complex with the Fe-Mn center of sweet potato purple acid phosphatase., Schenk G, Gahan LR, Carrington LE, Mitic N, Valizadeh M, Hamilton SE, de Jersey J, Guddat LW, Proc Natl Acad Sci U S A 2005 Jan 11;102(2):273-8. Epub 2004 Dec 29. PMID: 15625111

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