830
An exogenously expressed Cbf alpha 2 -encoded subunit ( CBF alpha 2-451 ) stimulated transcription from the SL3 enhancer in P19 and HeLa cells .
 ( cell line: HeLa cells, None) , ( protein: Cbf alpha 2, None) , ( DNA: SL3 enhancer, None) , ( protein: CBF alpha 2-451, None) , ( protein: P19, None) , ( protein: CBF alpha, None) , ( protein: Cbf alpha 2 -encoded subunit, 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:
 ( cell line: HeLa cells, None) , ( protein: Cbf alpha 2, None) , ( DNA: SL3 enhancer, None) , ( protein: CBF alpha 2-451, None) , ( protein: P19, None) , ( protein: CBF alpha, None) , ( protein: Cbf alpha 2 -encoded subunit, None) 