Institution: | 1. Institute of Pathology, University of Freiburg, Albertstra?e 19, D-7800, Freiburg 2. Institute of Pathology, Ludwig-Aschoff-Haus, University of Freiburg, FRG 3. Department of Anatomy II, University of Heidelberg, D-6900, Heidelberg 4. The Norwegian Radiumhospital and Institute for Cancer Research, N-Oslo-3, Norway
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