IL-2 is required not only for cell cycle progression but also to protect Ag-activated T cells from programmed cell death .
il-2 is required not only for cell cycle progression but also to protect ag-activated t cells from programmed cell death .
B-protein_molecule O O O O O O O O O O O O B-cell_type I-cell_type I-cell_type O B-other_name I-other_name I-other_name O