A golden yellow or yellow-brown insoluble protein produced by phagocytic digestion of hematin; found in most tissues, especially in the liver, spleen, and bone marrow, in the form of granules much larger than ferritin molecules (of which they are believed to be aggregates), but with a higher content, as much as 37%, of iron; stains blue with Perl Prussian blue stain. [hemo- + G. sideros, iron, + -in]
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he·mo·sid·er·in or chiefly Brit hae·mo·sid·er·in .hē-mō-'sid-ə-rən n a yellowish brown granular pigment formed by breakdown of hemoglobin, found in phagocytes and in tissues esp. in disturbances of iron metabolism (as in hemochromatosis, hemosiderosis, or some anemias), and composed essentially of colloidal ferric oxide compare FERRITIN
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he·mo·sid·er·in (he″mo-sidґər-in) [hemo- + Gr. sidēros iron] an intracellular storage form of iron, found in the form of pigmented yellow to brown granules consisting of a complex of ferric hydroxides, polysaccharides, and proteins with an iron content of about 33 per cent by weight.Medical dictionary. 2011.