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(A) Computer model of a human heteropolymer ferritin with 70% H subunits (cyan) and 30% L subunits (red). (B, C, D) Ferritin view through the 4-fold (B), the 3-fold (C) and the 2-fold (D) channels. (E) Schematic view of an individual ferritin subunit showing the five-helices (A, B, C, D, and E) and the di‑iron ferroxidase center residues.
