tokens: The replicative form of Epstein-Barr virus ( EBV ) DNA was studied using two lymphoblastoid cell lines , X50-7 and 6F11 , which are latently infected by Epstein-Barr virus .
folded_tokens: the replicative form of epstein-barr virus ( ebv ) dna was studied using two lymphoblastoid cell lines , x50-7 and 6f11 , which are latently infected by epstein-barr virus .
labels: O O O O B-virus I-virus O B-virus O O O O O O B-cell_line I-cell_line I-cell_line O O O O O O O O O O B-virus I-virus O