2Z70:
reference: Nonspecific base recognition mediated by water bridges and hydrophobic stacking in ribonuclease I from Escherichia coli., Rodriguez SM, Panjikar S, Van Belle K, Wyns L, Messens J, Loris R, Protein Sci. 2008 Apr;17(4):681-90. Epub 2008 Feb 27. PMID: 18305191

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