13490
CONCLUSION: These results indicate that (1) IgE production in asthma and HIE usually is associated with elevated levels of IL-4 , but not IL-13 , in the peripheral blood; (2) the increased sera IL-4 levels in asthma and HIE are not sufficient to induce Stat6 activation in PBMCs ; and (3) evidence of switch recombination to epsilon may be detected in isolated cases of elevated IgE .
 IgE, IL-13, IL-4, PBMCs, IL-4, IgE, Stat6
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, IL-13, IL-4, PBMCs, IL-4, IgE, Stat6