1. From the Institutes of Developmental Genetics,
2. Pathology, and3Institute of Pathology, Technische Universita¨t Mu¨nchen, Mu¨nchen, Germany;
3. From the Institutes of Developmental Genetics,4Fraunhofer IME, Aachen, Germany;
4. Max-Delbru¨ck-Center for Molecular Medicine, Gene Mapping Center, Berlin-Buch, Germany; and6Cologne Center for Genomics, University of Cologne, Cologne, Germany; and
5. Experimental Genetics, Helmholtz Center Munich-German Research Center for Environmental Health, Neuherberg, Germany;8Molekulares Krebsforschungszentrum, Charite´-Universita¨tsmedizin, Berlin, Germany.
6. Experimental Genetics, Helmholtz Center Munich-German Research Center for Environmental Health, Neuherberg, Germany;
7. Lehrstuhl fu¨r Molekulare Tierzucht und Biotechnologie, Ludwig-Maximilians-Universita¨t, Mu¨nchen, Germany.