8291
Our studies thus indicate that, despite the rapidity of NK cell-mediated lysis , AP-1 transcription factor is activated during the early stage of NK cell cytolytic programs and that engagement of NK cell inhibitory receptors for MHC class I molecules impairs the very early activation of AP-1 .
 ( protein: AP-1 transcription factor, None) , ( protein: NK cell inhibitory receptors, None) , ( protein: AP-1, None) , ( protein: MHC class I molecules, 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: AP-1 transcription factor, None) , ( protein: NK cell inhibitory receptors, None) , ( protein: AP-1, None) , ( protein: MHC class I molecules, None) 