13475
Coupling of the upstream beta globin sequence from approximately -500 to -250 bp to the truncated delta promoter fragment led to complete extinction of transcription activity, consistent with a negative regulatory effect of the beta globin gene upstream element (s).
 ( DNA: upstream beta globin sequence, None) , ( DNA: delta promoter, None) , ( DNA: beta globin gene upstream element, 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: upstream beta globin sequence, None) , ( DNA: delta promoter, None) , ( DNA: beta globin gene upstream element, None) 