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We propose a model in which stimulation of monocytes by IFN activates de novo synthesis of an inhibitory factor , possibly one or more members of the SOCS/ SSI/CIS gene family , capable of suppressing activation of STAT6 by IL-4 and IL-13 .
 monocytes, IL-13, STAT6, IFN, IL-4, inhibitory factor, SOCS/ SSI/CIS gene family
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:
 monocytes, IL-13, STAT6, IFN, IL-4, inhibitory factor, SOCS/ SSI/CIS gene family