NANCY KEDERSHA / SCIENCE PHOTO LIBRARY NANCY KEDERSHA / SCIENCE PHOTO LIBRARY
Breast cancer. Immunofluorescent light micrograph of cultured human breast cancer cells. Round nuclei of individual cells are seen. These cells have been treated with chemicals and enzymes to make the cell membrane permeable and to "chop up" the chromosomes in the nucleus. Staining the cells reveals DNA-genetic material (blue) & proteins which hold the DNA in chromosomal structures (green). Also seen are heat shock proteins (red) both in and around the nuclei. These protect the cell in times of stress. Immunofluorescence is a staining technique which uses antibodies to attach fluorescent dyes to specific molecules within cells. Magnification: x624 at 6x4.5cm size.
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