CECIL H. FOX / SCIENCE PHOTO LIBRARY CECIL H. FOX / SCIENCE PHOTO LIBRARY
Light micrograph of cancer cells of the human breast, growing in a culture. These cells are growing outwards from a site at centre top. The most actively dividing cells are coloured yellow/ green. A cancerous tumour arises through the transformation of normal cells into ones that escape the usual moderating controls of growth and differentiation. Instead the cell becomes large, divides rapidly and displays nuclear & chromosomal abnormality. Although rate of growth and division is abnormal among malignant cells, they are dis- tinguished by their ability to invade surrounding tissue and colonize sites far distant from the original tumour (known as metastasis).
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