CD40 is a functional activation antigen and B7-independent T cell costimulatory molecule on normal human lung fibroblasts .
cd40 is a functional activation antigen and b7-independent t cell costimulatory molecule on normal human lung fibroblasts .
B-protein_molecule O O O B-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O B-cell_type I-cell_type I-cell_type O