5447
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 .
 ( protein: deoxyribonuclease I, None) , ( DNA: transcription start site, None) , ( DNA: cell type-specific enhancer, None) , ( DNA: cell type-specific enhancer region, None) , ( DNA: deoxyribonuclease I hypersensitive site, None) , ( DNA: 3kb upstream, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: deoxyribonuclease I, None) , ( DNA: transcription start site, None) , ( DNA: cell type-specific enhancer, None) , ( DNA: cell type-specific enhancer region, None) , ( DNA: deoxyribonuclease I hypersensitive site, None) , ( DNA: 3kb upstream, None) 