Using this system , we observed that CD28 stimulation by B7-transfected CHO cells induced a proliferative response in T cells that was not accompanied by measurable IL-2 production .
using this system , we observed that cd28 stimulation by b7-transfected cho cells induced a proliferative response in t cells that was not accompanied by measurable il-2 production .
O O O O O O O B-protein_molecule O O B-cell_line I-cell_line I-cell_line O O O O O B-cell_type I-cell_type O O O O O O B-protein_molecule O O