1679
Platelet-activating factor ( PAF ) positively auto-regulates the expression of human PAF receptor transcript 1 ( leukocyte-type ) through NF-kappa B .
 ( protein: PAF, None) , ( protein: human PAF receptor transcript 1, None) , ( protein: NF-kappa B, None) , ( protein: Platelet-activating factor, 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: PAF, None) , ( protein: human PAF receptor transcript 1, None) , ( protein: NF-kappa B, None) , ( protein: Platelet-activating factor, None) 