1. The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot 76100, Israel
2. ARO-Volcani Center, P.O.B.6 Bet Dagan 50250 Israel
3. Stanford Genome Technology Center, Stanford University, California, 94304, USA
4. Department of Biological Sciences, Stanford University, California, 94305, USA
5. USDA-ARS, Avian Disease and Oncology Laboratory, 3606 E. Mount Hope Rd. East Lansing, MI 48823, USA
6. Institute for Animal Breeding Mariensee, Federal Agricultural Research Centre (FAL); 31535 Neustadt; Germany