Institution: | 1. Department of Genetics, University of California, Berkeley, California, USA 2. Department of Molecular Biology, Max Planck Institute for Experimental Medicine, D-3400, G?ttingen, Germany 3. Department of Molecular, Cellular and Developmental Biology, University of Coorado, Boulder, Colorado, USA 4. Department of Zoology, University of Freiburg, Sch?nzlestr. 1, D-7800, Freiburg, Germany
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