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AIPMTAIPMT 2000Body Fluids and Circulation
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WBCs are the colourless nucleated amoeboid cells that can squeeze through blood capillaries by a process known as diapedsis. The increase in their number causes leukaemia, a cancer. WBCs are of two types, granulocytes (formed in bone marrow) and agranulocytes (formed in bone marrow and thymus).