The Blood cell reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Blood cell

A blood cell is any cell of any type normally found in blood. In mammals, these fall into three general categories:

• red blood cells, whose main purpose is the transport of oxygen
• white blood cells, which act as immune cells and fight infection
• Platelets, which are actually fragments of the large bone marrow cells known as megakaryocytes and are important in blood clotting

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