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Prostate cancer cells. Immunofluorescent light micrograph of prostate cancer cells. The large cell nuclei (blue) are typical of the rapid cell division that occurs in cancer. Proteins in the cytoplasm are dark green and TIAR, a protein which stops the overproduction of other proteins, is orange. The fuzzy cells at lower centre and top right are undergoing mitotic cell division. Prostate cancer is one of the most common male cancers, mainly occurring in the elderly. Treatment involves removing the prostate gland or radiotherapy. In immunofluorescence, fluorescent dyes are attached to specific tissues using antibodies. Magnification: x200 at 5x7cm size. (KEYSTONE/SCIENCE PHOTO LIBRARY/NANCY KEDERSHA)