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Antibody mass production, conceptual image. Computer artwork representing the mass production of monoclonal antibodies. These Y-shaped antibodies are engineered to be identical and specific to only one type of antigen on the surface of their target. Because of their specificity they can be used to deliver cytotoxic (cell destroying) agents to specific cells without affecting other cells in the body. (KEYSTONE/SCIENCE PHOTO LIBRARY/RAMON ANDRADE 3DCIENCIA)