7476
Together, these results demonstrate that ER and PR can be activated by endogenous or exogenous ligands to induce a genetic response that impairs TNF-alpha -induced apoptosis in U937 cells .
 ( cell line: U937 cells, None) , ( protein: PR, None) , ( protein: TNF-alpha, None) , ( protein: ER, 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: U937 cells, None) , ( protein: PR, None) , ( protein: TNF-alpha, None) , ( protein: ER, None) 