1. Department of Biochemistry and McGill Cancer Center, McGill University, Montreal, Quebec, Canada, H3G 1Y6.
2. Department of Environmental and Life Sciences, University of Eastern Piedmont, 15100 Alessandria, Italy.
3. Laboratory of Molecular Histology, San Raffaele Scientific Institute, 20132 Milan, Italy.
4. Department of Biochemistry, Case Western Reserve University, Cleveland, OH 44106–4935, USA.
5. Department of Biophysics, Institute of Experimental Physics, Warsaw University, 02-089 Warsaw, Poland.