We have previously identified an enhancer element , PRE-I , that is essential for the function of the human IL-4 promoter .
we have previously identified an enhancer element , pre-i , that is essential for the function of the human il-4 promoter .
O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O O O O O O O O B-DNA_domain_or_region B-protein_molecule O O