13608
Retinoic acid inhibits CD40 + interleukin-4 -mediated IgE production in vitro.
 IgE, CD40, interleukin-4
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:
 IgE, CD40, interleukin-4