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Ferritin is a universal intracellular protein that stores Iron and releases it in a controlled fashion. The protein is produced by almost all living Organisms, including archaea, bacteria, algae, higher plants, and animals. It is the primary intracellular iron-storage protein in both prokaryotes and eukaryotes, keeping iron in a soluble and non-toxic form. In humans, it acts as a buffer against iron deficiency and iron overload. [from Wikipedia]
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