1. Institute of Organic Chemistry and Biochemistry of the CAS, Flemingovo namesti 2, 166 10 Prague, Czech Republic
2. First Faculty of Medicine, Charles University, Katerinska 32, 121 08 Prague, Czech Republic
3. Department of Genetics and Microbiology, Faculty of Science, Charles University, Vinicna 5, 128 44 Prague 2, Czech Republic
4. Institute of Macromolecular Chemistry of the CAS, Heyrovskeho namesti 2, 162 06, Prague 6, Czech Republic
5. Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 128 43 Prague 2, Czech Republic