Leukaemia cell. Coloured scanning electron micrograph (SEM) of a leukaemic (cancerous)white blood cell. Typical of many cancer cells the nucleus (red TEM) is complex in shape, the cell walls are covered in projections (SEM) and the cytoplasm contains a large number of organelles (TEM). Leukaemia is a type of cancer that affects the bone marrow and white blood cells (leucocytes), disrupting the levels of normal, healthy blood cells and resulting in damage to the immune system (among other symptoms). Possible treatments include anti-cancer drugs, radiotherapy and bone marrow transplants. Magnification: x8000 when printed at 10 centimetres wide. For a series of comparisons between SEMs and TEMs see images C047/7006 to C047/7034.