tokens: The cloned cell lines are derived from 12-day fetal liver and are transformed with a truncated form of c-myb , which lacks the normal autoregulatory sequences .
folded_tokens: the cloned cell lines are derived from 12-day fetal liver and are transformed with a truncated form of c-myb , which lacks the normal autoregulatory sequences .
labels: O B-cell_line I-cell_line I-cell_line O O O B-body_part I-body_part I-body_part O O O O O O O O B-DNA_domain_or_region O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O