كرية حمراء هدفية

thumb|Codocytes in human blood (Giemsa stain) thumb|Target cell compared to other forms of poikilocytosis. Codocytes, also known as target cells, are red blood cells that have the appearance of a shooting target with a bullseye. In optical microscopy these cells appear to have a dark center (a central, hemoglobinized area) surrounded by a white ring (an area of relative pallor), followed by dark outer (peripheral) second ring containing a band of hemoglobin. However, in electron microscopy they appear very thin and bell shaped (hence the name codo-: bell). Because of their thinness they are re