1. Dept. of Animal Physiology and Development, Inst. of Experimental Biology, Faculty of Biology; Adam Mickiewicz Univ. in Poznań; ul. Umultowska 89 Poznań 61-614 Poland.
2. Electron and Confocal Microscope Laboratory, Faculty of Biology; Adam Mickiewicz Univ. in Poznań; ul. Umultowska 89 Poznań 61-614 Poland