645
These functions of PAF appeared to be mediated through the cell surface PAF receptors , as two PAF receptor antagonists , WEB 2086 and L-659,989 , blocked both the up-regulation of HB-EGF mRNA and kappa B binding activity induced by PAF .
 ( protein: PAF, None) , ( protein: PAF, None) , ( protein: HB-EGF, None) , ( protein: cell surface PAF receptors, None) , ( RNA: HB-EGF mRNA, None) , ( protein: PAF, None) , ( protein: PAF, 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: PAF, None) , ( protein: HB-EGF, None) , ( protein: cell surface PAF receptors, None) , ( RNA: HB-EGF mRNA, None) , ( protein: PAF, None) , ( protein: PAF, None) 