3707
In addition to NB4 cells, ATRA also activated IRF-1 gene expression in HL-60 , U937 , and THP-1 cells , which all respond to ATRA by growth inhibition .
 ( cell line: U937, None) , ( cell line: THP-1 cells, None) , ( DNA: IRF-1 gene, None) , ( cell line: HL-60, 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:
 ( cell line: U937, None) , ( cell line: THP-1 cells, None) , ( DNA: IRF-1 gene, None) , ( cell line: HL-60, None) 