1. Tumour Virology Laboratory, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
2. Molecular Virology Research Unit, Adam Mickiewicz University, Poznan, Poland
3. Protein Networks, International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
4. Instituto de Biología Molecular y Celular de Rosario-CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina