6490
In contrast to IL-12 , no up-regulation of IRF-1 was found in IL-4 -stimulated cells , and IL-4 did not block IL-12 -dependent up-regulation of IRF-1 .
 IL-4, IL-4 -stimulated cells, IRF-1, IL-12, IL-12, IL-4, IRF-1
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:
 IL-4, IL-4 -stimulated cells, IRF-1, IL-12, IL-12, IL-4, IRF-1