1. Laboratory of Pain research, Institute of Physiology, Czech Academy of Sciences, 142 20 Prague, Czech Republic
2. Department of Molecular Genetics, Bioptická Laboratoř s.r.o., 326 00 Pilsen, Czech Republic
3. Department of Zoology, Faculty of Science, University of South Bohemia, 370 05 České Budějovice, Czech Republic
4. Dairy Research Institute Ltd., Ke Dvoru 21a, Prague 160 00, Czech Republic