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Structure of aquo-cobalamin and base-on/base-off conformations. A, aquo-cobalamin in the base-on conformation in which the 5′,6′-dimethyl-benzimidazole base is coordinated to the Co3+ ion at the α-site. B, the base-on and base-off conformations. The variable interacting ligands as well as the α- and β-sites are indicated. Ado, AdoCbl; Me, MeCbl.
