tokens: The latter issue was investigated by comparing , in 8 cases , constitutive DNA from skin fibroblasts with leukemic DNA .
folded_tokens: the latter issue was investigated by comparing , in 8 cases , constitutive dna from skin fibroblasts with leukemic dna .
labels: O O O O O O O O O O O O B-DNA_family_or_group I-DNA_family_or_group O B-cell_type I-cell_type O B-DNA_family_or_group I-DNA_family_or_group O