1IQB:
reference: Structure of Urtica dioica agglutinin isolectin I: dimer formation mediated by two zinc ions bound at the sugar-binding site., Harata K, Schubert WD, Muraki M, Acta Crystallogr D Biol Crystallogr 2001 Nov;57(Pt 11):1513-7. PMID: 11679714

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