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CONCLUSIONS: In the present work, we show that human fetal and adult erythroid progenitors are distinct in their transcription factors , and that the commitment to fetal or adult program occurs at a very early differentiation stage.
 transcription factors
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