tokens: A phenotypic drift from latency I to latency III has been observed previously in some BL cell lines .
folded_tokens: a phenotypic drift from latency i to latency iii has been observed previously in some bl cell lines .
labels: O O O O B-other_name I-other_name O B-other_name I-other_name O O O O O O B-cell_line I-cell_line I-cell_line O