hematoidin (he-ma-toy´din)

A pigment derived from hemoglobin which contains no iron but is closely related to or similar to bilirubin. H. is formed intracellularly, presumably within reticuloendothelial cells, but is often found extracellularly after 5 to 7 days in foci of previous hemorrhage. It occurs as refractile, yellow-brown and orange-red granules, but more characteristically as rhomboid plates arranged in a radial pattern, so-called h. burrs.blood crystals, hematoidin crystals; [hemato- + G. eidos, resemblance, + -in]


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