This silencer is inactive in the most immature DN thymocytes , which probably use a distinct silencer mechanism to down-regulate CD4 gene expression .
this silencer is inactive in the most immature dn thymocytes , which probably use a distinct silencer mechanism to down-regulate cd4 gene expression .
O O O O O O O B-cell_type I-cell_type B-cell_type O O O O O O B-other_name I-other_name O O B-DNA_domain_or_region I-DNA_domain_or_region O O