The complex on the proximal site ( NF kappa B2 ) appears to be composed of p50 and relB .
the complex on the proximal site ( nf kappa b2 ) appears to be composed of p50 and relb .
O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-protein_complex I-protein_complex I-protein_complex O O O O O O B-protein_subunit O B-protein_subunit O