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In addition, HLA-DRA gene expression is inducible in a variety of cell types by interferon-gamma ( IFN-gamma ).
 interferon-gamma, HLA-DRA gene, IFN-gamma
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:
 interferon-gamma, HLA-DRA gene, IFN-gamma