NANCY KEDERSHA / IMMUNOGEN / SCIENCE PHOTO LIBRARY NANCY KEDERSHA / IMMUNOGEN / SCIENCE PHOTO LIBRARY
Skin cancer. Immunofluorescent Light Micrograph of squamous carcinoma cells, cultured from a tumour. This highly malignant cancer arises in epithelium: typically of the skin. The cell nuclei (blue) are large; cytoplasm stains green & red (for keratin), colours changing to red as the cancer grows. Keratin is a fibrous skin protein. Squamous cell carcinoma can be caused by high exposure to sunlight. It is common in pale-skinned fair-haired people over age 60. Immunofluorescence is a tech- nique which uses antibodies to attach fluorescent dyes to specific tissues and to molecules within the cell. Magnification: x125 at 35mm size.
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