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.
 FcR, MAPK, Raf-1, dominant negative mutants, Ras, mitogen-activated protein kinase, nuclear factor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 FcR, MAPK, Raf-1, dominant negative mutants, Ras, mitogen-activated protein kinase, nuclear factor