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We have investigated the signal transduction pathway from Fc receptors that leads to gene activation and production of cytokines in monocytes .
 cytokines, Fc receptors, monocytes
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:
 cytokines, Fc receptors, monocytes