2317
The oxygen radical scavenger N-acetyl-L-cysteine , but not an inhibitor of nitric oxide synthase , inhibited LIF -induced HIV replication .
 ( protein: nitric oxide synthase, None) , ( protein: LIF, 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: nitric oxide synthase, None) , ( protein: LIF, None) 