tokens: Third , only the 50 kD protein was retained on a biotinylated DNA-streptavidin matrix when the DNA fragment contained the TRE -DNA .
folded_tokens: third , only the 50 kd protein was retained on a biotinylated dna-streptavidin matrix when the dna fragment contained the tre -dna .
labels: O O O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O B-other_name I-other_name I-other_name O O O O O O B-DNA_domain_or_region O O