12763
Flow cytometric and morphological analyses demonstrated that the addition of CD70 transfectants to B cell cultures remarkably promoted differentiation into plasma cells in the presence of IL-4 and CD40 signaling .
 ( protein: CD40, None) , ( cell type: plasma cells, None) , ( cell line: B cell cultures, None) , ( protein: IL-4, 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: CD40, None) , ( cell type: plasma cells, None) , ( cell line: B cell cultures, None) , ( protein: IL-4, None) 