1251
Treatment of serum-free grown HL60 cells with 5 x 10(-7) M all-trans RA or 9-cis RA resulted in sub-optimal neutrophil differentiation (up to 25% mature cells).
 ( cell line: HL60 cells, None) , ( cell line: serum-free grown HL60 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:
 ( cell line: HL60 cells, None) , ( cell line: serum-free grown HL60 cells, None) 