4072
DNase I hypersensitive site ( DHS ) mapping revealed that the perforin locus contained six DHS within 7.0 kb of the 5' upstream sequence (-7.0 kb) and two DHS in intron 2 .
 ( DNA: intron 2, None) , ( DNA: DHS, None) , ( DNA: DHS, None) , ( DNA: perforin locus, None) , ( DNA: 5#$%# upstream sequence, None) , ( DNA: DHS, None) , ( DNA: DNase I hypersensitive site, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: intron 2, None) , ( DNA: DHS, None) , ( DNA: DHS, None) , ( DNA: perforin locus, None) , ( DNA: 5#$%# upstream sequence, None) , ( DNA: DHS, None) , ( DNA: DNase I hypersensitive site, None) 