13240
The data presented here indicate that (1) the 12-lipoxygenase activity of murine macrophages is upregulated in vitro and in vivo by IL-4 and/or IL-13 , (2) this upregulation requires expression of the transcription factor STAT6 , and (3) the constitutive expression of the enzyme appears to be STAT6 independent .
 STAT6, transcription factor, STAT6, IL-4, 12-lipoxygenase, IL-13
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:
 STAT6, transcription factor, STAT6, IL-4, 12-lipoxygenase, IL-13