1. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Praha 6, Czech Republic
2. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
3. Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 2120 00 Prague, Czech Republic
4. Institute of Biotechnology of the Czech Academy of Sciences, Průmyslová 595, 252 50 Vestec, Czech Republic