1. Department of Human Anatomy and Genetics (M.H.A., H.M.C.), University of Oxford, Oxford OX1 3QX, United Kingdom
2. Division of Cell Sciences (P.J.B., A.M., P.J.O.), University of Glasgow Veterinary School, Glasgow G61 1QH, United Kingdom
3. Laboratory for Experimental Medicine and Endocrinology (G.V., K.D.G.), Catholic University of Leuven, B-3000 Leuven, Belgium
4. Unité Mixte de Recherche 6175 (F.G.), Institut National de la Recherche Agronomique, Centre National de Recherche Scientifique, Université de Tours, 37380 Nouzilly, France