1. Department
of Cell Biology, Faculty of Science, Charles University, Viničná
7, 128 43 Prague
2, Czech Republic
2. Institute
of Microbiology, v.v.i., The Czech Academy of Sciences, Vídeňská
1083, 142 20 Prague
4, Czech Republic
3. Department
of Biochemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic