What soluble iron-protein complex is the form in which iron is stored in tissues?

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Ferritin is the soluble iron-protein complex in which iron is stored in tissues. It is found in all cells and helps regulate iron levels in the body. Transferrin is a protein that transports iron in the blood. Hemosiderin is a less soluble iron-protein complex that is found in tissues when there is an excess of iron. Hemoglobin is a protein found in red blood cells that binds and transports oxygen.

What Soluble Iron-Protein Complex Is the Form in Which Iron