8RNT:
reference: Structure of ribonuclease T1 complexed with zinc(II) at 1.8 A resolution: a Zn2+.6H2O.carboxylate clathrate., Ding J, Choe HW, Granzin J, Saenger W, Acta Crystallogr B 1992 Apr 1;48 ( Pt 2):185-91. PMID: 1515106

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