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a Topology diagram of the ferritin from Pyrococcus furiosus (PfFtn). b Ribbon diagram of PfFtn showing the location of the ferroxidase center sites A, B and C (orange spheres) near the center of the four-helical bundle. c Superposition of the PfFtn Cα chain with those of its eight closest homologous structures. In b and c, the molecule colors change from blue to red in the N-terminal to C-terminal direction. b, c Prepared with PyMOL [50]
