12845
In contrast, expression of dominant negative mutants of Ras and Raf-1 , in these cells, did not have any effect on FcR -mediated nuclear factor activation , suggesting that the mitogen-activated protein kinase ( MAPK ) signaling pathway was not used by these receptors.
 ( protein: FcR, None) , ( protein: MAPK, None) , ( protein: Raf-1, None) , ( protein: dominant negative mutants, None) , ( protein: Ras, None) , ( protein: mitogen-activated protein kinase, None) , ( protein: nuclear 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: FcR, None) , ( protein: MAPK, None) , ( protein: Raf-1, None) , ( protein: dominant negative mutants, None) , ( protein: Ras, None) , ( protein: mitogen-activated protein kinase, None) , ( protein: nuclear factor, None) 