tokens: In erythroid K562 cells in which the HS2 enhancer is active , the HS2 sequence directs the synthesis of long enhancer transcripts that are initiated apparently from within the enhancer and elongated through the intervening DNA into the cis-linked CAT gene .
folded_tokens: in erythroid k562 cells in which the hs2 enhancer is active , the hs2 sequence directs the synthesis of long enhancer transcripts that are initiated apparently from within the enhancer and elongated through the intervening dna into the cis-linked cat gene .
labels: O B-cell_line I-cell_line I-cell_line O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O O O O B-DNA_domain_or_region O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O