tokens: HB9 RNA transcripts were most prevalent in several human B cell lines and K562 cells .
folded_tokens: hb9 rna transcripts were most prevalent in several human b cell lines and k562 cells .
labels: B-DNA_domain_or_region O O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O B-cell_line I-cell_line O