2ENR:
reference: Zinc/calcium- and cadmium/cadmium-substituted concanavalin A: interplay of metal binding, pH and molecular packing., Bouckaert J, Loris R, Wyns L, Acta Crystallogr D Biol Crystallogr 2000 Dec;56 Pt 12:1569-76. PMID: 11092923

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