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Structure of Heme b; "Fe" is the chemical symbol of iron, "II" indicates its oxidation state.. Iron is an essential bioelement for most forms of life, from bacteria to mammals.
Iron-deficiency anemia is anemia caused by a lack of iron. [3] Anemia is defined as a decrease in the number of red blood cells or the amount of hemoglobin in the blood. [3] When onset is slow, symptoms are often vague such as feeling tired, weak, short of breath, or having decreased ability to exercise. [1]