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Ferritin is a major iron storage protein found in humans and most living organisms.Each ferritin is comprised of 24 subunits, which self-assemble to form a cage-like nanostructure.In nature, the interiors of FRTs are filled with iron.When expressed artificially in an iron-free condition, the yielded apoferritins are hollow, comprising a cavity that can be loaded with different species.Ferritin nanocages can be genetically modified to present a peptide sequence on the surface.