Institution: | (1) Department of Genetics, University of Leicester, LE1 7RH Leicester, UK;(2) Department of Genetics, Agricultural College of Athens, Votanicos, Athens, Greece;(3) Present address: Genetics Group, ARC Poultry Research Centre, EH25 9PS Roslin, Midlothian, UK;(4) Present address: Department of Biochemistry, Medical School, University of Nottingham, Nottingham, UK |