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We propose that the MNP protein (s) binding at the MNP site constitutes a novel transcription factor (s) expressed in hematopoietic cells .
 MNP site, MNP protein, transcription factor, hematopoietic cells
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:
 MNP site, MNP protein, transcription factor, hematopoietic cells