14646
The microA motif was required for microB-dependent enhancer activity , which suggests that a minimal B cell-specific enhancer is composed of both the PU.1 and Ets-1 binding sites .
 ( protein: PU.1, None) , ( DNA: PU.1 and Ets-1 binding sites, None) , ( DNA: microB-dependent enhancer, None) , ( protein: Ets-1, None) , ( DNA: microA, None) , ( DNA: minimal B cell-specific enhancer, 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: PU.1, None) , ( DNA: PU.1 and Ets-1 binding sites, None) , ( DNA: microB-dependent enhancer, None) , ( protein: Ets-1, None) , ( DNA: microA, None) , ( DNA: minimal B cell-specific enhancer, None) 