Curiously , the TCF-1 alpha binding element was inactive in vivo when removed from its neighboring elements on the TCR alpha enhancer and positioned in one or more copies upstream of a heterologous promoter .
curiously , the tcf-1 alpha binding element was inactive in vivo when removed from its neighboring elements on the tcr alpha enhancer and positioned in one or more copies upstream of a heterologous promoter .
O O O B-protein_molecule I-protein_molecule O O O O O O O O O O O O O O B-protein_family_or_group O O O O O O O O O O O O B-DNA_family_or_group I-DNA_family_or_group O