13971
In both types of donors, the effect of IL-13 on IL-2 -induced IFN-gamma production was in marked contrast to the strong inhibition seen with IL-4 in NK cells .
 IL-4, IFN-gamma, IL-13, NK cells, IL-2
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, IFN-gamma, IL-13, NK cells, IL-2