<prompt> Ferritin - an inactive form of iron is stored inGutSpleenLiverAll of the above  <response>: Ferritin is a protein that is impoant in the metabolism of iron. Under normal conditions, it stores iron that can be called upon for use as conditions require. In conditions of excess iron eg, hemochromatosis, body stores of iron are greatly increased and much more ferritin is present in the tissues, such as the liver,bone marrow and spleen. Absorption of iron: Fe3 is conveed to Fe2 by ferric reductase, and Fe2 is transpoed into the enterocyte by the apical membrane iron transpoer DMT1. Heme is transpoed into the enterocyte by a separate heme transpoer HT, and heme oxidase HO releases Fe2 from the heme. Some ofthe intracellular Fe2 is conveed to Fe3 and bound by ferritin. Reference : Harpers 30th edition , chapter Plasma proteins and immunoglobulins. 