12721
We conclude that sodium phenylacetate treatment of K562 cells increases gamma-globin mRNA and induces cell maturation as judged by morphology without affecting the expression of the erythroid transcription factors , some of which are known to be involved in the regulation of beta-like globin genes .
 ( protein: erythroid transcription factors, None) , ( DNA: beta-like globin genes, None) , ( protein: transcription factors, None) , ( cell line: K562 cells, None) , ( RNA: gamma-globin mRNA, 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: erythroid transcription factors, None) , ( DNA: beta-like globin genes, None) , ( protein: transcription factors, None) , ( cell line: K562 cells, None) , ( RNA: gamma-globin mRNA, None) 