Overview: In the last few years the study of germinal centers of the lymphoid tissue has progressed at an accelerated pace. Questions about their role and their significance in immune responses that could not be answered, mainly because of tedmicallimitations, are presently approached experimentally from many different directions. Hypotheses, some more than half a century old, receive renewed attention. At this time, members of the Biology Division, Oak Ridge National Laboratory, U.S.A., and of the Institute of Pathology, University of Bern, Switzerland, decided to bring together workers inter
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