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Our results indicate that human allergen-specific Th cells with strongly polarized Th2 cytokine profiles do not respond to IL-12 and, therefore, cannot be induced to produce IFN-gamma .
 IL-12, IFN-gamma, cytokine
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-12, IFN-gamma, cytokine