14331
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 .
 ( protein: transcription factors, None) , ( cell line: K562 cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: transcription factors, None) , ( cell line: K562 cells, None) 