The identification of a tissue-specific deoxyribonuclease I hypersensitive site approximately 3kb upstream of the transcription start site led to the characterization of a cell type-specific enhancer region .
the identification of a tissue-specific deoxyribonuclease i hypersensitive site approximately 3kb upstream of the transcription start site led to the characterization of a cell type-specific enhancer region .
O O O O O B-protein_molecule I-protein_molecule O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O O