1 Department of Gametes and Embryo Biology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748, Olsztyn, Poland. Electronic address: s.judycka@pan.olsztyn.pl.
2 Department of Gametes and Embryo Biology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748, Olsztyn, Poland.