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Since one of the few transcription factors which have been implicated in the regulation of monocyte genes is the macrophage- and B-cell-specific PU.1 transcription factor , we investigated whether PU.1 binds and activates the M-CSF receptor promoter .
 transcription factors, M-CSF, PU.1, monocyte genes, PU.1, transcription factor, M-CSF receptor promoter, macrophage- and B-cell-specific PU.1, M-CSF receptor
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, M-CSF, PU.1, monocyte genes, PU.1, transcription factor, M-CSF receptor promoter, macrophage- and B-cell-specific PU.1, M-CSF receptor