Affiliation: | 17.The National Veterinary Institute, Oslo, Norway ;27.Department of Microbiology and Immunology, Norwegian College of Veterinary Medicine, Oslo, Institute of Transplantation Immunology, National Hospital, P. O. Box 8156, Dep., N-0033 Oslo 1, Oslo, Norway ;37.Department of Animal Husbandry and Genetics, Norwegian College of Veterinary Medicine, Oslo, Norway ;47.Institute of Animal Breeding, Division of Immunogenetics, Veterinary School of University of Berne, Switzerland |