SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Cell division in normal skin. Illustration of a vertical cross-section through skin, showing the cell layers and normal cell division. Across bottom is connective tissue (yellow). The first layer of skin cells above the connective tissue is called the basal layer. Above that is the differentiation zone. At top is the outer layer of differentiated keratinised skin cells. Here, the cells in the basal layer are dividing at a normal rate, with chromosomes (green) replicating and moving apart to produce new cells that move upwards through the skin layers. For a set of images showing cell division in normal, wounded and cancerous skin, see images C023/8583 to C023/8585.
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