Affiliation: | (1) German Cancer Research Center, Institute for Immunology and Genetics, Postfach 101949, D-6900 Heidelberg, Germany;(2) Department of Cell Research, Wallenberg Laboratory, P. O. Box 562, Uppsala, Sweden;(3) Department of Medical Chemistry, Biomedical Center, P. O. Box 575, Uppsala, Sweden;(4) Tumor Immunology Unit, Faculty of Medicine, Cordoba, Spain |