In contrast , formation of the B1 complex , reflecting the binding of p75 and p85 , critically depends upon the more 3' sequences of this enhancer element .
in contrast , formation of the b1 complex , reflecting the binding of p75 and p85 , critically depends upon the more 3' sequences of this enhancer element .
O O O O O O B-protein_complex I-protein_complex O O O O O B-protein_subunit O B-protein_subunit O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O