1. Department of Experimental Medicine, Molecular and Cellular Biology Section; University of Perugia; Via del Giochetto 06100 Perugia Italy
2. Department of Cellular Biochemistry and Clinic Enzymology Section; University of Perugia; Via del Giochetto 06100 Perugia Italy
3. Inserm U 282, Hopital H. Mondor; 94010 Creteil France