Codocyte

Codocytes, also known as target cells or Mexican hat 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 conta...
Found on http://en.wikipedia.org/wiki/Codocyte
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