833
The longest form, CBF beta -187 , increased the transcriptional stimulation by CBF alpha 2-451 twofold in HeLa cells , although it had no effect in P19 cells .
 ( protein: CBF alpha 2-451, None) , ( cell line: P19 cells, None) , ( cell line: HeLa cells, None) , ( protein: P19, None) , ( protein: CBF beta -187, None) , ( protein: CBF beta, None) , ( protein: CBF alpha, 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: CBF alpha 2-451, None) , ( cell line: P19 cells, None) , ( cell line: HeLa cells, None) , ( protein: P19, None) , ( protein: CBF beta -187, None) , ( protein: CBF beta, None) , ( protein: CBF alpha, None) 