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The putative ligands of the metal binding site in the ferritin-like superfamily of proteins. The ligands (or putative ligands) of a diiron binding site in Pyrococcus furiosus ferritin (PfFtn), Escherichia coli bacterioferritin, Desulfovibrio vulgaris rubrerythrin, and P. furiosus archaeoferritin (AFR) are shown in blue. The residues of a third iron binding site in P. furiosus ferritin are shown in red
