3A6F:
reference: Substitution of Glu122 by Glutamine Revealed the Function of the Second Water Molecule as a Proton Donor in the Binuclear Metal Enzyme Creatininase., Yamashita K, Nakajima Y, Matsushita H, Nishiya Y, Yamazawa R, Wu YF, Matsubara F, Oyama H, Ito K, Yoshimoto T, J Mol Biol. 2010 Jan 4. PMID: 20043918

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