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A set of engineered ferritin mutants from Archaeoglobus fulgidus (Af-Ft) and Pyrococcus furiosus (Pf-Ft) bearing cysteine thiols in selected topological positions inside or outside the ferritin shell have been obtained. The two apo-proteins were taken as model systems for ferritin internal cavity accessibility in that Af-Ft is characterized by the presence of a 45Å wide aperture on the protein surface...