tokens: Northern blot analysis showed that a majority of these genes were expressed at comparable levels in U-937 and HeLa cells .
folded_tokens: northern blot analysis showed that a majority of these genes were expressed at comparable levels in u-937 and hela cells .
labels: B-other_name I-other_name I-other_name O O O O O O O O O O O O O B-cell_line O B-cell_line I-cell_line O