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Thus the response of K562 cells to HMBA may provide a useful experimental system for studying the molecular mechanisms responsible for downmodulation of lineage-restricted transcription factors during hemopoietic lineage commitment .
 transcription factors, K562 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:
 transcription factors, K562 cells