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Skin cancer. Light micrograph of melanoma cancer cells in human skin. These are melanocytes, the cells that produce the brown pigment melanin. Their cell nuclei (purple) are extremely varied in shape. Cancer cells undergo continuous division, growing chaotically. Clumps of these cells form tumours that can impair the normal functioning of the organs. Melanoma cells are highly malignant, invading and destroying surrounding tissues, and migrating (metastasizing) to other parts of the body where they seed secondary tumours. Treatment is by excision, with radiotherapy or chemotherapy needed if the cancer has spread.
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