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To determine and compare protein/DNA interactions at the native IFN-gamma locus in T cells , we analyzed the human IFN-gamma promoter by ligation-mediated polymerase chain reaction (LM-PCR) techniques .
 IFN-gamma, IFN-gamma, T cells, human IFN-gamma promoter
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:
 IFN-gamma, IFN-gamma, T cells, human IFN-gamma promoter