tokens: Unexpectedly , the CD4 silencer is also active in CD4+ CD8int/- cells of the thymus , implying that an anti-silencer may be required to resume CD4 expression in this cell population .
folded_tokens: unexpectedly , the cd4 silencer is also active in cd4+ cd8int/- cells of the thymus , implying that an anti-silencer may be required to resume cd4 expression in this cell population .
labels: O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-cell_type I-cell_type I-cell_type O O B-body_part O O O O O O O O O O B-protein_molecule O O O O O O