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These studies suggest that, by inhibiting AP-1 activation , Nef may play a role in regulating HIV-1 gene expression in infected T-cells .
 infected T-cells, Nef, AP-1, HIV-1 gene
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:
 infected T-cells, Nef, AP-1, HIV-1 gene