tokens: In sharp contrast , in B cells treated with the phorbol ester 12-O-tetradecanoylphorbol-13-acetate ( TPA ) , strong interactions between the X2 box and NF-X2 containing c-Fos were observed .
folded_tokens: in sharp contrast , in b cells treated with the phorbol ester 12-o-tetradecanoylphorbol-13-acetate ( tpa ) , strong interactions between the x2 box and nf-x2 containing c-fos were observed .
labels: O O O O O B-cell_type I-cell_type O O O B-other_organic_compound I-other_organic_compound B-other_organic_compound O B-other_organic_compound O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O B-protein_molecule O O O