1. Institute of Molecular Genetics of the ASCR, 142 20 Prague, Czech Republic
2. Institute of Experimental Medicine, 142 20 Prague, Czech Republic
3. RIKEN BioResource Center, Ibaraki 305-0074, Japan
4. Faculty of Veterinary Medicine, University of Teramo, Teramo 64100, Italy
5. Institute of Animal Science, 140 00 Prague, Czech Republic