PR. J. BERNARD / CNRI / SCIENCE PHOTO LIBRARY PR. J. BERNARD / CNRI / SCIENCE PHOTO LIBRARY
Acute lymphoblastic leukaemia. Light micrograph of blood cells from bone marrow in a case of acute lymphoblastic leukaemia. Leukaemia is a cancer where certain blood cells form in excess. There are several acute forms, classified according to the type of cell affected. Acute lymphoblastic leukaemia is a cancer where excess white blood cell precursors called lymphoblasts form in bone marrow. These precursor cells form a type of white blood cell called lymphocytes. These cells are of a sarcoma type with visible nucleoli.
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