Roberto J. Poljak, a professor and head of the structural immunology laboratory at the Pasteur Institute in Paris since 1981, has taken a position as director of the Center for Advanced Research in Biotechnology (CARB) in Rockville, Md. Established in 1984, CARB is a research institute founded by the University of Maryland's Biotechnology Institute and the National Institute of Standards and Technology.

Poljak is known for developing the first three-dimensional models of key antibodies and antigens (A.G. Amit, et al., "Three- dimensional structure of an antigen-antibody complex at 2.8 A resolution," Science, 233:747-53, 1986). Born and educated in Argentina, he came to the United States in 1958 as a postdoc at the Massachusetts Institute of Technology. From 1962 to 1981 he was a biophysics professor at Johns Hopkins University School of Medicine.

Children's Research Hospital in Memphis, Tenn. Scientists at the 30-year-old St. Jude perform research in pediatric cancer, sickle...

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