In this study , a CD40 -dependent B cell culture system was used to examine the role of different signal transduction elements .
in this study , a cd40 -dependent b cell culture system was used to examine the role of different signal transduction elements .
O O O O O B-protein_molecule O O O O O O O O O O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O