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Breast cancer cells. Coloured scanning electron micrograph (SEM) of two breast cancer cells in the final stage of cell division. During this stage, known as cytokinesis, the cells' cytoplasm divides. Here, only a thin cytoplasmic bridge (at centre) remains between them. These rounded cells have an uneven surface with many cytoplasmic projections. Typically, cancer cells are large and they divide rapidly in a chaotic manner. Clumps of these cells form tumours which possess the ability to invade and destroy surrounding tissues. Breast cancer is the most common form of cancer in women. Magnification unknown. (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER) === ===