tokens: Differences in LTR sequence also resulted in differences in transcription factor recruitment to cis-acting sites within the U3 region of the LTR , as demonstrated by electrophoretic mobility shift assays .
folded_tokens: differences in ltr sequence also resulted in differences in transcription factor recruitment to cis-acting sites within the u3 region of the ltr , as demonstrated by electrophoretic mobility shift assays .
labels: O O B-DNA_domain_or_region O O O O O O B-other_name I-other_name I-other_name O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region O O O O B-other_name I-other_name I-other_name I-other_name O