BSIP, ERMAKOFF / SCIENCE PHOTO LIBRARY BSIP, ERMAKOFF / SCIENCE PHOTO LIBRARY
Cell culture research. Female technician using a light microscope to examine cultured white blood cells (seen magnified on the monitor) for genetic research. Some culture flasks are at lower right. B-lymphocyte white blood cells are usually short-lived, but these have been infected with an inactivated virus. The virus has inserted its genetic material into the lympho- cytes, resulting in them dividing indefinitely.
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