tokens: Antigen recognition stimulates limited proliferation , whereas infection with Epstein-Barr virus ( EBV ) results in continual proliferation and the outgrowth of immortal cell lines .
folded_tokens: antigen recognition stimulates limited proliferation , whereas infection with epstein-barr virus ( ebv ) results in continual proliferation and the outgrowth of immortal cell lines .
labels: O O O O O O O O O B-virus I-virus O B-virus O O O O O O O O O B-cell_line I-cell_line I-cell_line O