Affiliation: | From the Departments of ‡Biochemistry and Molecular and Structural Biology and ;§Molecular and Biomedical Sciences, Jožef Stefan Institute, Ljubljana SI-1000, Slovenia, ;the ¶Department of Biotechnology, National Institute of Chemistry, Ljubljana SI-1000, Slovenia, and ;the ‖Molecular Oncology Group, McGill University, Montreal, Quebec H3A 1A1, Canada |