9414
Ctx combined with TNFalpha or IL-1beta to produce a synergistic increase in p24 antigen production in U1 promonocytic cells .
 ( protein: TNFalpha, None) , ( protein: p24 antigen, None) , ( cell line: U1 promonocytic cells, None) , ( protein: IL-1beta, None) , ( protein: Ctx, 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: TNFalpha, None) , ( protein: p24 antigen, None) , ( cell line: U1 promonocytic cells, None) , ( protein: IL-1beta, None) , ( protein: Ctx, None) 