In contrast , a mutant of Tax that selectively fails to activate nuclear NF-kappa B expression does not associate with p100 .
in contrast , a mutant of tax that selectively fails to activate nuclear nf-kappa b expression does not associate with p100 .
O O O O O O B-protein_molecule O O O O O O B-protein_molecule I-protein_molecule O O O O O B-protein_molecule O