PR. J. BERNARD / CNRI / SCIENCE PHOTO LIBRARY PR. J. BERNARD / CNRI / SCIENCE PHOTO LIBRARY
Chronic lymphocytic leukaemia. Light micrograph of blood cells from bone marrow in a case of chronic lymphocytic leukaemia, also called chronic lymphoid leukaemia (CLL). Leukaemia is a cancer where certain blood cells form in excess. There are several forms, classified according to the type of cell affected. CLL is a cancer where excess white blood cells called lymphocytes form. This sample shows diffuse infiltration by mature lymphocytes (dark red).
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