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Because STAT6 activation is essential for IL-4 -induced gene expression , we examined the ability of type I and type II IFNs to regulate activation of STAT6 by IL-4 in primary human monocytes .
 IFNs, IL-4, primary human monocytes, STAT6, IL-4, STAT6, human 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:
 IFNs, IL-4, primary human monocytes, STAT6, IL-4, STAT6, human monocytes