[1] Univ Bern, Inst Genet, Vetsuisse Fac, CH-3001 Bern, Switzerland
[2] Swiss Coll Agr, CH-3052 Zollikofen, Switzerland
[3] Lab Racing Chem, Dept Mol Genet, Utsunomiya, Tochigi 3200851, Japan
[4] Japan Racing Assoc, Equine Res Inst, Lab Mol & Cellular Biol, Utsunomiya, Tochigi 3200856, Japan
[5] Univ Calif Davis, Vet Genet Lab, Davis, CA 95616 USA
[6] Certagen GmbH, D-53359 Rheinbach, Germany