<unk>  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.<unk>  is found in most tissues as a cytosolic protein, but small amounts are secreted into the serum where it functions as an iron carrier. Plasma<unk>  is also an indirect marker of the total amount of iron stored in the body; hence, serum<unk>  is used as a diagnostic test for iron-deficiency anemia. Aggregated<unk>  transforms into a toxic form of iron called hemosiderin.<unk>  is a globular protein complex consisting of 24 protein subunits forming a hollow nanocage with multiple metal–protein interactions.<unk>  that is not combined with iron is called apoferritin.
Ferritin
Hepcidin
Hemoglobin
Ovoferrin
Lipoic acid
Toxidrome
Plasminogen 
Plasma-lyte