Institution: | (1) Immunology Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, 10021 New York, NY, USA;(2) Present address: Department of Molecular Biology University of Geneva, CH-1211 Geneva 4, Switzerland;(3) Present address: Departments Physiology and Biophysics, Columbia University, 630 West 168 Street, BB1103, 10032 New York, NY, USA |