1. Department of Reproduction and Developmental Biology, Institute of Plant Genetics and Biotechnology, Slovak Academy of Sciences, Nitra, Slovakia, Institute of Virology, Center of Molecular Medicine, BITCET, Slovak Academy of Sciences, Bratislava, Slovakia, Department of Biophysics and Radiobiology, Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine, Kyiv, Ukraine, and Department of Nuclear Chemistry, Faculty of Science, Commenius University, Bratislava, Slovakia