1. Department of Microbial Biochemistry, Institute of Biochemistry and Biophysics of the Polish Academy of Sciences, Warsaw
2. Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin
3. Department of Tumor Biology, Centre of Oncology, M. Skłodowska-Curie Memorial Institute, Gliwice, Poland
4. Department of Genetics and Biochemistry, Institute of Microbiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany
5. Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, Maryland