1. Faculty of Agriculture in Osijek; J.J. Strossmayer University of Osijek; Kralja Petra Svačića 1d 31000 Osijek Croatia
2. The Roslin Institute and R(D)SVS; University of Edinburgh; Easter Bush Midlothian EH25 9RG UK
3. Swedish University of Agricultural Sciences; SE-750 07 Uppsala Sweden
4. Pig Research Centre; Danish Agriculture & Food Council; Axeltorv 3 København V 1609 Denmark
5. MRC Human Genetics Unit; MRC IGMM; University of Edinburgh; Crewe Road Edinburgh EH4 2XU UK