1. Microbiology and Virology Unit, Department of Life Sciences and Systems Biology, University of Torino, Via Accademia Albertina 13, 10123 Turin, Italy
2. Plant Physiology Unit, Department of Life Sciences and Systems Biology, University of Torino, Via Quarello 15/a, 10135 Torino, Italy
3. Department of Molecular Medicine, University of Padova, 35121 Padova, Italy