1WSF:
reference: Identification of single Mn(2+) binding sites required for activation of the mutant proteins of E.coli RNase HI at Glu48 and/or Asp134 by X-ray crystallography., Tsunaka Y, Takano K, Matsumura H, Yamagata Y, Kanaya S, J Mol Biol 2005 Feb 4;345(5):1171-83. Epub 2004 Dec 16. PMID: 15644213

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