1. Laboratory of Cell BiologyDepartment of Genetics, Biology and Medical Chemistry
2. Postgraduate School of Clinical PathologyUniversity of Torino Medical School 10126 Torino Italy
3. Instituto de Parasitología y Biomedicina, Consejo Superior de Investigaciones Científicas 18001 Granada Spain
4. Division of ImmunologyBeth Israel HospitalHarvard Medical School Boston Massachusetts 02115 USA
5. Institute of Biology and GeneticsUniversity of Ancona Medical School 60131 Ancona Italy