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The ferritin fold. Proteins in the ferritin superfamily are characterized by a four-helix bundle coordinating a pair of metal ions. The helices are arranged in a characteristic up-down-down-up topology. The location of the metal coordinating residues is indicated in purple. The figure is based on the Desulfovibrio desulfuricans bacterioferritin structure (Protein Data Bank code 1nfv).
