1. Laboratory of Developmental Genetics; Institute of Experimental Endocrinology; Slovak Academy of Sciences; Vlárska 3 83306 Bratislava Slovakia
2. Department of Genetics; Comenius University; Mlynská dolina, B-1 84215 Bratislava Slovakia
3. Department of Medical Biochemistry; Jessenius Faculty of Medicine; Comenius University; Mala Hora 4 03601 Martin Slovakia
4. Institute of Cellular Biology and Pathology; 1st Faculty of Medicine; Charles University in Prague; Albertov 4 12800 Prague Czech Republic
5. Department of Biology; University of Nebraska at Omaha; 6001 Dodge Street Omaha NE 68182-0040 USA
6. German Cancer Research Centre; Neuenheimer Feld 581 D-69120 Heidelberg Germany
7. VIT-University; Vellore Tamil Nadu India