2075
This resulted in only a partial inhibition of TNF -or PMA- induced HIV replication in U1 cells , and no detectable effect on HIV replication in chronically infected U937 cells .
 ( protein: TNF, None) , ( cell line: U937 cells, None) , ( cell line: chronically infected U937 cells, None) , ( cell line: U1 cells, 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: TNF, None) , ( cell line: U937 cells, None) , ( cell line: chronically infected U937 cells, None) , ( cell line: U1 cells, None) 