tokens: Reverse transcriptase-polymerase chain reaction was used to examine HB9 RNA transcripts in hematopoietic cell lines .
folded_tokens: reverse transcriptase-polymerase chain reaction was used to examine hb9 rna transcripts in hematopoietic cell lines .
labels: B-other_name I-other_name I-other_name I-other_name O O O O B-DNA_domain_or_region O O O B-cell_line I-cell_line I-cell_line O