tokens: Characterization of the CD48 gene demonstrates a positive element that is specific to Epstein-Barr virus -immortalized B-cell lines and contains an essential NF-kappa B site .
folded_tokens: characterization of the cd48 gene demonstrates a positive element that is specific to epstein-barr virus -immortalized b-cell lines and contains an essential nf-kappa b site .
labels: O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O B-virus I-virus O O O O O O O B-protein_molecule I-protein_molecule O O