TED KINSMAN / SCIENCE PHOTO LIBRARY TED KINSMAN / SCIENCE PHOTO LIBRARY
Skin cancer cell, coloured scanning electron micrograph (SEM). Skin cancer arises from the skin's melanocytes, the cells that produce the pigment melanin which gives skin its colour. Melanoma is an aggressive cancer that often spreads (metastasizes) to other tissues of the body. This sample came from the forearm of an 83 year old woman. The blue dots are skin bacteria. The main cause of melanoma is exposure to ultraviolet radiation in sunlight. Magnification: x4000 when printed at 10 centimetres wide.
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