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Apoferritins

The protein components of Ferritins. ApoFerritins are shell-like structures containing nanocavities and ferroxidase activities. Apoferritin shells are composed of 24 subunits, heteropolymers in Vertebrates and homopolymers in Bacteria. In Vertebrates, there are two types of subunits, Light chain and heavy chain. The heavy chain contains the ferroxidase activity.