tokens: It is most likely that the presence of a silencer contributes to the more stringent activation requirements of naive CD4+ T cells .
folded_tokens: it is most likely that the presence of a silencer contributes to the more stringent activation requirements of naive cd4+ t cells .
labels: O O O O O O O O O B-DNA_family_or_group O O O O O B-other_name I-other_name O B-cell_type I-cell_type I-cell_type I-cell_type O