tokens: One hour pulse-treatment with 3 microM etoposide caused topoisomerase associated , primary DNA breakage , which was rapidly followed by apoptosis .
folded_tokens: one hour pulse-treatment with 3 microm etoposide caused topoisomerase associated , primary dna breakage , which was rapidly followed by apoptosis .
labels: O O O O O O B-other_organic_compound O B-protein_family_or_group O O B-other_name I-other_name I-other_name O O O O O O B-other_name O