12547
The 5'-positive regulatory unit , consisting of the promoter and the 5' enhancer , is already active at the CD4 - CD8 -double-negative (DN) stage of development.
 ( DNA: 5#$%# enhancer, None) , ( DNA: 5#$%#-positive regulatory unit, None) , ( DNA: promoter, None) , ( protein: CD4, None) , ( protein: CD8, 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: 5#$%# enhancer, None) , ( DNA: 5#$%#-positive regulatory unit, None) , ( DNA: promoter, None) , ( protein: CD4, None) , ( protein: CD8, None) 