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The class II-specific transcription factors RFX and CIITA are also required for expression, as cell lines deficient in these factors failed to allow transcription from the DM promoters .
 transcription factors, RFX, DM promoters, class II-specific transcription factors, CIITA
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:
 transcription factors, RFX, DM promoters, class II-specific transcription factors, CIITA