1927- . Argentine molecular biologist who developed monoclonal antibodies, giving immunity against specific diseases. He shared the Nobel Prize for Medicine 1984. Milstein, who settled in Britain 1961, was engaged on research into the immune system at the Laboratory of Molecular Biology in Cambridge. He and his colleagues devised a means of accessing the immune system for purposes of research, diagnosis, and treatment. They developed monoclonal antibodies (MABs), cloned cells that, when introduced into the body, can be targeted to seek out sites of disease. The full potential of this breakthrough is still being investigated. However, MABs, which can be duplicated in limitless quantities, are already in use to combat disease. Milstein shared the Nobel Prize for Medicine with two colleagues, George Kohler and Niels Jerne. Milstein and his colleagues, while working at Britain's Cambridge University, devised a means of accessing the immune system for purposes of research, diagnosis, and treatment. They developed monoclonal antibodies (MABs), cloned cells that, when introduced into the body, can be targeted to seek out sites of disease. The full potential of this breakthrough is still being investigated. However, MABs, which can be duplicated in limitless quantities, are already in use to combat disease. Milstein shared the Nobel Prize for Medicine with two colleagues, George Kohler and Niels Jerne.