1. Department
of Biosciences, University of Oslo, N-0371 Oslo, Norway
2. Tumor
Immunology lab, Department of Pathology, Rikshospitalet, Oslo University Hospital and University of Oslo, N-0424 Oslo, Norway
3. Institute
for Experimental Infection Research, TWINCORE, Center for Experimental
and Clinical Infection Research, a joint venture between the Helmholtz Centre for Infection Research, Braunschweig, and the Hannover Medical School, D-30625 Hannover, Germany