A storage form of iron is:

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Ferritin is a protein that stores iron in a non-toxic form in the liver, spleen, and bone marrow. It releases iron when needed and is a key component in preventing iron overload in the body. Pappenheimer bodies are small granules of iron found in red blood cells and are not a storage form of iron. Hemoglobin is a protein found in red blood cells that transports oxygen and does not store iron. Transferrin is a protein that binds to iron in the blood and transports it throughout the body.

A Storage Form of Iron Is