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Second, in contrast to recent results on human cell lines , CIITA is not critically involved in the IFN-gamma -induced up-regulation of MHC class I genes .
 human cell lines, CIITA, IFN-gamma, MHC class I genes
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:
 human cell lines, CIITA, IFN-gamma, MHC class I genes