1. Cells, Organisms and Molecular Genetics School of Life Sciences University of Nottingham Nottingham NG7 2RD UK
2. The Jackson Laboratory 600 Main Street Bar Harbor ME 04609 USA
3. Centre for Tropical Livestock Genetics and Health The Roslin Institute Edinburgh EH25 9RG UK
4. LiveGene International Livestock Research Institute (ILRI) P.O. 5689 Addis Ababa Ethiopia